in whales are modified into broad paddle like flippers

Like a jumbo jet, it was thought that whales steer by banking with their flippers. These initial traits evolved only once among chelonioids, and the bauplan was refined through a secondary process of specialization. Their massive flippers look like paddles and keep the animal balanced in the water. well placed to exert turning forces on the whale. Unlike the manatee they have a hairless body and a fluked horizontal tail like a whale's. Belugas can produce a series of chirps, clicks, whistles and squeals . The skeletal elements are rigidly supported by connective tissue: thick cartilage pads lie lengthwise between the bones. flipper. The walrus is found in the Arctic Ocean and in subarctic seas. Using aerial photography and filming,. Scale models of the flippers from large-bodied (body length > 6 m) cetaceans (fin whale, killer whale, sperm whale) were constructed from computed tomography (CT) scans of flippers. If any of the genes are missing, if they are misread, read out of sequence, or altered in any way, the cell or organism may dramatically change. The ecology of . Aliquam porttitor vestibulum nibh, eget, Nulla quis orci in est commodo hendrerit. 3. cricket. Adult beluga whales are easily distinguished by their often pure white skin, their small size and their lack of dorsal fin. Their whiskers are sensitive to the movements of small sea creatures. Flipper noun A flat, wide, paddle-like rubber covering for the foot, used in swimming. Fetus Reveals Ancestry. Belugas are majestic sociable creatures that are well adapted to their arctic and subarctic environment. They are closely related to manatees, and they never leave the water. Beluga whales are also known as "sea canaries," and are one of the most the most vocal of all whales. Add a one-line explanation of what this file represents. Belugas have a broad, rounded head and a large forehead.Belugas are toothed whales. wings modified into flippers- very strong breast muscles Tail modified as broad horizontal fluke. Tylosauurs was hard to handle since it would eat anything that would enter its water. prefer warm water and will migrate to it The tubercles on the leading edge act as passive-flow control devices that improve performance and maneuverability of the flipper. Humpback whales are a favorite of whale watchersthey are often active, jumping out of the water and slapping the surface with their pectoral fins or tails. * they are the only birds with a sense of smell Elephant seals sort of scoot their bodies outside of the water. and their tail is enlarged and flattened horizontally to form a fluke or paddle. b Manatees have paddle - shaped tails more like a beaver that moves vertically while swimming . Whales Whales have streamlined bodies tapering toward the horizontal tail that distinguishes them from fish. flattened, spade-shaped teeth, small whales with a distinctive beak (3) No claws, no hind limbs and no external ears. D. Pectoral flippers. any of an order of sea mammals with flippers budda superdrive 45 head cheapest places to live in south america Navigation. They have wider flippers that are triangular in shape, especially mature females of the vaquita have larger flippers than the males of the vaquita. Primarily aquatic, beavers are found in rivers and lakes in Europe, Asia and throughout North America, except northern Canada, the southern deserts of the United States and Mexico. Fur seals are semiaquatic mammals. These 30- to 50-pound rodents can greatly change whole environments with their dam-building activities. A detailed guide of everything you want and need to know about fish. into Flippers Paddle or oar-shaped Rounded or Pointed Long & wing-like in Humpback whales Limited movement of pectoral fins Vestigial bones of . covered in waterproof feathers This made it hard for the keepers to take care of it. A drone has captured the moment when a paddle boarder had a close encounter with two curious whales in Argentina. What is the basis for the ordering of the elements in the activity series? Order - Cetacea. dolphins and whales), pinnipeds (e.g. Hippopotami leave the water at dusk to feed on land vegetation. All living whales lack hindlimbs and have forelimbs modified as flippers. ibuprofen. Enter a series of 1s, 2s, 3s, and 4s into the array to represent people at a local school function; 1 represents an infant, 2 represents a child, 3 represents a teenager, and 4 represents an adult. Its flippers are grey-whitish in color and are one-third in size in relation to their body length, with knobs on the edges. > LONGSIIIFS LlGIlTliOUSE. Flippers are used for different types of propulsion, control, and rotation. The adult male walrus weighs more than 2,000 pounds. Surprisingly, Its hind flipper has a large surface area that is an advantageous feature to propel through the water easily. They have conical, pointed teeth in the lower or both jaws, or one tusklike tooth in the upper jaw. Forelimbs modified into paddle-like flippers. Didemnum . The forelimbs of baleen whales are pectoral flippers. internal reproductive organs to remain streamline, toothed whales- for catching and holding prey diet: sea urchins, clams, abalone, crabs and it prefers hard substrate, like dock pilings, over soft sediment (Bullard et al. This makes them spend most of their time underwater. efficient oxygen removal from the air (~90%) We have compiled a list of 17 animals that have flippers. However, Its front flippers are used for scooping and also to bring the aquatic vegetation into their mouth. Answer (1 of 2): #NotAllPenguins The ones that do gather pebbles generally do it to build nests in areas where other methods won't work. Hyperphalangy was present among extinct ichthyosaurs, plesiosaurs, and mosasaurs. Study with Quizlet and memorize flashcards containing terms like toothed whales, family ziphiidae, family physeteridae and more. eyes small, broad fan-like ears, huge trunk, thick pillar like legs and small tail. mother-calf bond remains strong even after the calf if fully weaned, Marine Birds, Reptiles, & Mammals Crossword, Ch. 1. the presence of exterior ears or pinnae. The tubercles on the flippers of humpback whales improve the hydrodynamics of the flipper at their size. Vaquita have relatively large front flippers in proportion to their body. Whales today do not have feet, so of course they don't have hooves. 1. the flat broad limb of seals, whales, penguins, and other aquatic animals, specialized for swimming. Writing on a diverse range of topics, she reflects her passion for business, interior design, home decorating, style, fashion and pets. Beluga whales use their pectoral flippers mainly to steer and, with the help of the flukes, to stop. PECTORAL FLIPPERS 1. [5], The foreflippers used by the pinnipeds act as oscillatory hydrofoils. Manatees are completely aquatic, but like all marine mammals they need to breathe. predatory and scavenging (can use tools such as bread to lure prey) Animals with flippers include penguins (whose flippers are also called wings ), cetaceans (e.g. Evolved from a 4-limbed terrestrial ancestor; Adult has vestiges of pelvic girdle. It weighs up to 25 pounds. Here is a list of thirty-four types of mammals that are found in India. These large marine mammals can measure 10 feet long and weigh up to 2,000 pounds. Other articles where forelimb is discussed: penguin: Form and function: is the transformation of the forelimb into a paddle. Wildlife Informer is reader-supported. In marine mammals, these dorsally positioned nostrils are called the blowhole. But food was abundant in the seas. Show algorithmically generated translations. Shape The World. On this Wikipedia the language links are at the top of the page across from the article title. monogamous after courtships that can last years, expandable pouch under bill at some point in their lives Tetrapod limbs which have evolved into fin-like structures are usually (but not always) called "flippers" rather than fins. : The humpback has the longest flippers of any whale, and they lie substantially forward of the whale's center of mass, well placed to exert turning forces on the whale. Evolution. Belugas have a broad, rounded head and a large forehead. They have a dark dorsal surface, faint gray lateral sides, a white color ventral surface along with flippers, dorsal fin, and tail fin. The process continued over time, and a very derived form of hyperphalangy, with six or more phalanges per digit, evolved convergently in rorqual whales and oceanic dolphins, and was likely associated with another wave of signaling within the interdigital tissues. Found in swamps, marshes, and wetlands from northern North America to the Gulf coast and the Mexican border, they are about 2 feet long and up to 4 pounds. outer ear is not connected to the inner ear Advertisement. eat bottom invertebrates Dugong are in the same family as manatees. However, no claws are present in any flippers including fore flippers and hind flippers. The word "cetacean" is derived from the Greek word for whale, ktos. ~80 species which evolved . Paddle-like flippers The wings are modified into flattened broad bones with the joint of the elbow and wrist almost fused. They are incredibly intelligent and very social animals that live in family groups called pods. Based in Ontario, Susan Dorling has written professionally since 2000, with hundreds of articles published in a variety of popular online venues. Three adaptations of terrestrial vertebrates, must support all of their weight (tetrapods). From the gracile and crescent-shaped flippers of a pilot whale, to the thick and door-like flippers of right whales, cetacean flippers come in lots of shapes and sizes (Figure 2, Figure 3) (Howell, 1930; Benke, 1993).Most delphinids have small and thin flippers, except the broad and thick flippers of the killer whale (Orcinus orca).Killer whales display sexual dimorphism in that the male . They are one of the two members of their family (Monodontidae). The 13 species of sea lions are divided into two groups, sea lions and fur seals. [4], Flippers on humpback whales (Megaptera novaeangliae) have non-smooth leading edges, yet demonstrate superior fluid dynamics to the characteristically smooth leading edges of artificial wings, turbines and other kinds of blades. They are massive, reaching over 50 feet in length and weighing in at over 40 metric tons. No other integer value should be accepted as valid input, and data entry should stop when a negative value is entered. Leatherback front flippers can measure up to almost 9 feet. Co3+(aq)+6NH3(aq)Co(NH3)63+\mathrm{Co}^{3+}(a q)+6 \mathrm{NH}_3(a q) \rightleftarrows \mathrm{Co}\left(\mathrm{NH}_3\right)_6^{3+} These vibrissae are also found around the mouth. . Whales have streamlined bodies tapering toward the horizontal tail that distinguishes them from fish. The snout and upper lip are prolonged into long, muscular, prehensile . Elephant seals are large, earless seals that have relatively small flippers compared to their large bodies. [12], Because of the specialization of flippers and their hydrodynamic constraints, it was thought that they were not used to significantly interact with the environment, unlike the legs of terrestrial tetrapods. 2. Their "nests" are a combination of a little pouch in their bellies: (Ima. Also called: fin (often plural) either of a pair of rubber paddle-like devices worn on the feet as an aid in swimming, esp underwater. In the flippers, the bones of each digit have thick cartilage pads. While resting they can stay submerged for up to 15 minutes; while swimming they need to breathe at the surface every three or four minutes. A beluga whale's pectoral flipper contains five digits much like the fingers on a human . . [12], Evers et al. eggs have hard shells that are resistant to desiccation, spend majority of lives at sea Whales Whales have streamlined bodies tapering toward the horizontal tail that distinguishes them from fish. Pinnipeds are aquatic mammals with all flour limbs modified into flippers. polyphyletic- multiple lineages Tail divided in two broad horizontal fleshy flukes with a notch, used in propulsion. Its flippers can extend another four meters (13 feet) in front of its . Penguins propel themselves through the water by flapping their flippers. The legs and webbed feet are set far back on the body, which causes penguins to walk upright on land and also to aid in streamlining and steering while swimming. must rest and breed on land Its diet is composed of water grasses, weeds and algae, and it eats as much as one-tenth of their body weight every day. Cetacea, "flipper footed" In this Article, We discover the Animals with flippers chosen from across the world. Five digits help support a broad flipper (e.g., right whales), while four digits closely appressed are seen in narrow, elongated flippers (e.g., humpback whales). The forelimbs of cetaceans, pinnipeds, and sirenians presents a classic example of convergent evolution. Though the flippers of modern cetaceans are not correctly described as webbed feet, the intermediate webbed limbs of ancient semiaquatic cetaceans may be described as such. homeotherms The presence of a flexible pelvic girdle helps them to move on the land as they are able to rotate their hind flippers similar to those four-legged animals. They have broad, paddle-like flippers and notched tails. FRIA Usable by all levels of play 0351 Accessory by Rick Sada Glossary of Selected Ulutiun Terms ahsukk: a trade board comprised of kiam from several neighboring lulutiun villages A humpback can measure up to 19 meters (62 feet) long. Although previous findings on eared seals suggested that thrust was generated by the initial outward movement of the fore flippers or the terminal drag-based paddling phase, the 2007 study found that little or no thrust was generated during those phases. spend months-years at open sea Comparing and contrasting cetaceans-pinnipeds, cetaceans-sirenians, and pinnipeds-sirenians, 2,351, 7,684, and 2,579 substitutions occur, respectively. These marine mammals have a prominent beak-like rostrum (snout), long front flippers, and large tail flukes. Their flippers developed gradually by a series of stepwise adaptations, with the most fundamental traits of flippers appearing in the deepest nodes (the earliest times) in their phylogeny. Your program should count the number of each 1,2,3, and 4 in the array and display a list of how many infants, children, teenagers, and adults were at the school function. The penguin body is fusiform and streamlined, adapted for swimming. What is an activity series of elements? Hind limbs absent in cetaceans and sirenians. Its body is long, slender, flexible and streamlined. young are fed by milk secreted by the mammary gland, pinnipeds- flipper footed This forms a tapered, flat flipper for swimming. An introduction to evolution: what is evolution and how does it work? 10 Tail is dorsoventrally flattened, ends into flaps and flukes. To catch their much smaller, more maneuverable prey, they have developed several unique locomotor strategies that. mammary slit to remain streamline pectoral limbs modified into broad paddle-like flippers. Humpback whales utilize extremely mobile, wing-like flippers for banking and turning. No claws, no hind limbs and no external ears. Our mission at Wildlife Informer is to share free information and pictures of wildlife with our readers. wings modified into flippers- very strong breast muscles hydrodynamic body 18 species; 17 in antarctica, 1 in galapagos . What Animals Live in a Tropical Rainforest? small ears and long necks Sed vehicula tortor sit amet nunc tristique mollis., Mauris consequat velit non sapien laoreet, quis varius nisi dapibus. filter feeders- take large gulps (expandable throat) to capture schools of fish and krill This is accompanied by a body morphology particularly adapted to movement in a liquid medium. Millions of years of adaptation to the sea have made seals expert swimmers and divers, but they are quite awkward on land. Aquatic and semiaquatic mammals are well adapted to life in the water with physical characteristics such as flippers, webbed feet, paddlelike tails and streamlined bodies. Surprisingly, It can achieve a speed of about 22 mph underwater while propelling itself through all four flippers. There are several species; the North American river otter lives along rivers, lakes and large creeks. [14] Based on presumed limb use in ancestral turtles, these behaviors may have occurred as long ago as 70 million years.[13]. 1. . While the fore-flippers help to propel, and swim through the water with efficiency. BY P. H. GOSSE, E.E.S., AUTHOR OF "EVEXINGS AT THE MICROSCOPE," &C., &C. PtTBLlSHED UNDER THE DIRECTION OF THE COMMITTEE . They dive up to 180 feet deep for clams and shellfish on the ocean floor, staying underwater for up to 30 minutes. Borax, Na2B4O710H2O\mathrm{Na}_2\mathrm{B}_4\mathrm{O}_7 \cdot 10\mathrm{~H}_2 \mathrm{O}Na2B4O710H2O, has a variety of household uses. dorsal fin The walrus is a close relative of sea lions and seals. (spermaceti organ- looks like sperm, huge in the sperm whale- where it gets its name; sperm whales can emit a sonic blast that can stun/ kill . The dorsal structure on cetaceans is called the "dorsal fin" and the large cetacean tails are referred to primarily as flukes but occasionally as "caudal fins"; neither of these structures are flippers. Cetacea is a scientific order of large aquatic mammals that have forelimbs modified into flippers, a . Flippers Wings are modified into paddle-like flippers. Pectoral flippers have all the skeletal elements of the forelimbs of terrestrial mammals, but they're foreshortened and modified into paddle-shaped appendages. Mammals; fore limbs modified into flippers; fluke; blowhole; two suborders: odontocetes and mysticetes; whales, dolphins, porpoises Within ten million years, whales were fully aquatic. Through research the articles are well crafted and users will able to find the useful information about animals. A vaquita is a small-sized porpoise species that belongs to Genus Phocoena, Family Phocoenidae, and is found in the Gulf of California, Gulf of California, Mexico, and other parts of the ocean. The pectoral flipper of beluga whales is actually a modified forelimb with the same skeletal element as the land mammals but are varied in size and adapted for aquatic life. Yet diversity among birds is not so striking as it is among mammals. Orcas large paddle-shaped flippers are not only used for agility and steering at fast speeds but also used to play. The animal's flippers are small but mighty, enabling them to swim at speeds of up to 17 miles per hour. The hippopotamus loves water and stays submerged up to 16 hours of the day. The duck-billed platypus lives in the freshwater rivers and streams of eastern Australia, Tasmania and New Guinea. They can use their long flippers to steer and the bumpy tubercles help with speed. keep warmth- layer of fat, feathers trap air bubbles (5) Endoskeleton entirely cartilaginous, without true bones (6) Notochord persistent. Whale skulls have small eye orbits, long snouts (with the exception of monodontids and ziphiids) and eyes placed on the sides of its head. [9] Hyperphalangy is an increase in the number of phalanges beyond the plesiomorphic mammal condition of three phalanges-per-digit. CETACEA. Expert solutions . Most smaller whales, and all the dolphins and porpoises, belong to the toothed whale suborder. 709 the relatively large head and the trunk, and tapers to a notched tail, horizontally flattened into flukes. uaoer UBRAIT NATURAL HISTORY IN ZOOLOGICAL GARDENS Natural History in Zoological Gardens BEING SOME ACCOUNT OF VERTEBRATED ANIMALS, WITH SPECIAL REFERENCE TO THOSE USUALLY TO BE S walruses, earless and eared seals), sirenians (e.g. (3175 kg). In this video, you can clearly see the blunt paddle-like flippers and the broad head which has callosities that form unique patterns. Thus, the front limbs became modified as paddle-shaped flippers, the bones of which are still reminiscent of jointed limbs and digits, but the hind limbs were lost . 2. ability to turn the hind flippers forward to walk on land 3. smaller than phocids 4. shallow divers preying on fast fish Two Sub Families of Otariidae Otariinae (sea lions) and Arctocephalinae (fur seals) Odobenidae Synapomorphies Family Odobenidae (walruses) Monophyletic group characterized by: It is also known as Tunicate because the body of an adult is enclosed within a tunic made up of cellulose -like substance known as tunicin. The ultimate fate of any one cell--whether it becomes a skin cell, a nerve cell, a kidney cell, or a bone cell--depends upon which genes are read. may live in cold waters (blubber to keep warm- also acts as cushioning when moving on land and ice, prevents organs from being crushed, and provides buoyancy), 19 species, monk seals are the only warm water species As the whales grew larger and more abundant, the fish they ate became scarcer and harder to find. Blog Inizio Senza categoria in whales are modified into broad paddle like flippers. Form constrains function, and the wings of diving flying species, such as the murre or cormorant have not developed into flippers. 15 Animals With Amazing Tusks (You Need To Know With Pictures), 23 Animals With Opposable Thumbs (+Pictures). nostrils are on top of head in a single or double opening (blowhole) blood is redirected only to vital organs They are well adapted to their arctic and sub-arctic environment, with a five . Captions 2. Find Science textbook solutions? Limbs: webbed feet are developed. pinnipeds use posterior flippers A thick layer of blubber beneath their skin helps to conserve heat. Order 13. Tail divided in two broad horizontal fleshy flukes with a notch, used in propulsion. This is easiest to see in whales and dolphins, like this beluga whale skull. more blood- more red blood cells- more hemoglobin Hindlimbs absent. float low in the water because their outer feathers lack oils to make it easier for them to dive, agile flyers (narrow wings and long forked tails) These tubercles or bumps are known to increase the aerodynamic flow of water while causing less resistance. The broad flat muzzle and mouth are angled down to enable ease of grazing along the seabed. A beluga whale's pectoral flipper contains five digits much like the fingers on a human . hydrodynamic body webbed, flipper-like hind feet spend almost entire life in the water, largest land carnivore The beluga can change the shape of its bulbous forehead, called a "melon", by blowing air around its sinuses Beluga whales' dives may last up to 25 minutes. Among turtles, observed behaviors include a green turtle holding a jellyfish, a loggerhead rolling a scallop on the sea floor, and a hawksbill turtle pushing against a reef for leverage to rip an anemone loose. Muskrats are good swimmers and can stay underwater up to 17 minutes, preferring to live in 4 to 6 feet of water. There may be competition for space and food between . A Sea lion is a marine mammal that belongs to Family Otariidae, Order Carnivora, and is found on the eastern coasts of South America, the Falkland Islands, and the southern coast of Australia. Animals that live in the water have evolved with special adaptations for mobility and survival in an aquatic environment. The rear flukesthe large appendage on a whale's tailprovide the thrust, like jet engines. The flippers are black in color that imparts black color from the dorsal body as well as from the lower jaw. Seals are unable to do this. [13] Use of the flippers for foraging behavior is observed in marine mammals such as walruses, seals, and manatee, and even in reptiles such as sea turtles. Calculate the power developed by an engine with torque 1250N1250 \mathrm{~N}1250N m applied at 5000rpm50 \overline{0} 0 \mathrm{rpm}5000rpm. They can use their long flippers to steer and the bumpy tubercles help with speed. Introduced intentionally and accidentally to North America, the nutria or coypus is native to Central and South America. Baleen whales with accordion-like pleats for expansion of throat. . Fur seals flippers are long and flexible. sperm whale. Here are several characteristics that show some of the major differences between whales and fish: Whales Are warm-blooded Breath air Give birth to their young Produce milk Fish Are cold-blooded Extract oxygen from the water using gills Lay eggs They aren't known for nurturing their young Note: Whales can vary greatly in terms of weights and size. cetaceans need to remain streamline- genital slits seasonal migrations from feeding to breeding grounds (long distances), internal copulation carnivores- spend 75% of their lives in water The tubercles break up the passage of water, maintaining even channels of the fast-moving water, limiting turbulence and providing greater maneuverability. However, the hydrodynamic control surfaces of fish are always referred to as "fins" and never "flippers". no external ears A thick layer of blubber beneath their skin helps to conserve heat. larger (6-27 m) As an Amazon Associate I earn from qualifying purchases. Large rounded tubercles along the leading edge of the flipper are morphological structures that are unique in nature. It lived during the time of the dinosaurs, but it was not a dinosaur. Adult Pacific Gray Whales can be 45 feet long and weight up to 33 tons. omnivores but prefer meat Sea otters can live up to 25 years in the wild. Define an array named peopletypes that can store a maximum of 50 integer values entered at the keyboard. They have no visible external ears. Flippers are one of the principal control surfaces of cetaceans (whales, dolphins and porpoises) due to their position in front of the center of mass, and their mobility which provides three degrees of freedom. Most odontocetes also reduce the number of phalangeal elements in digit V, while mysticetes typically retain the plesiomorphic condition of three phalanges. These species have cardiovascular system to help them to swim and at the same time it helps them to breathe underwater and they have specialized gills or wings to swim in the water without facing difficulties. 3. [8], Whales and their relatives have a soft tissue flipper that encases most of the forelimb, and elongated digits with an increased number of phalanges. As for their front legs, they lost their webbed toes and those dainty hooves, and became so thick and stumpy that they were no longer legs, but paddle-like flippers. Subjects. This major evolutionary transition set the stage . eat fish and squid Forelimbs are modified into broad paddle-like flippers while posterior limbs are absent. Skin is smooth with hairs. A flipper is a broad, flattened limb adapted for aquatic locomotion. Short wedge-shaped tail No claws, no hind limbs and no external ears. whale - WordReference English dictionary, questions, discussion and forums. Pectoral flippers have all the skeletal elements of the forelimbs of terrestrial mammals, but they're foreshortened and modified into paddle-shaped appendages. #english #englishlanguage #learnenglish #studyenglish. All four limbs are modified into paddle-like flippers, and the long tail has a fluke at the end. They have all the skeletal elements of the forelimbs of terrestrial mammals, but they're foreshortened and modified into paddle-shaped appendages. Eyes and ears are small reflecting the animal's lack of reliance on these senses. They are some of the smallest penguins in the world. Manatees have 3 to 4 nails that grow on each of their front flippers. no nails Eyes are small, external ears absent and mammary glands are well developed. A dugong is a marine mammal that belongs to Genus Dugong, Family Dugongidae, and is found in the Pacific, Indian Oceans, east Africa, the Red Sea, and Australia. The bones are flattened and broadened, with the joint of the elbow and wrist almost fused. reptiles evolved first then more reptiles, birds, and mammals evolved from the reptiles. About 375 million years ago, the first tetrapodsvertebrates with arms and legspushed themselves out of the swamps and began to live on land. Follow along as we learn more about animals with flippers. mostly viviparous- few exceptions Each bump has a hair sticking out of it called a vibrissa. A walrus, including the Atlantic walrus, the Pacific walrus, is a large-sized ocean mammal that belongs to Genus Odobenus, Family Odobenidae, and is found in the North Pole, the Pacific Ocean, Atlantic Ocean, and the Arctic Ocean. The whale's surprising dexterity is due primarily to its non-conventional flippers, which have large, irregular looking bumps called tubercles across their leading edges. can exhale and inhale very quickly Hind limbs of opossum and hippo are . Wings are modified into paddle-like flippers. The tail is short and wedge-shaped. Their wings are modified into paddle like flippers. Its flippers have four digits that can engage in continuous movement, and tail fins that are stronger enough to propel them to attain vertical movement.

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in whales are modified into broad paddle like flippers