whale evolution documentary

In part one, The Walking Whale shows how 50 million years ago, a hungry land animal got into shallow seawater. From the outside, they don't look much like whales at all. Following pakicetids and Ambulocetus in time as well as on the evolutionary branches leading to modern cetaceans are remingtonocetids, again a family known only from Pakistan and India. One of the things I personally find quite enjoyable about evolutionary theory is the counter-intuitiveness of some of the predictions it makes. Cheetahs, falcons, elephants and whales - meet the animal record breakers. Four million years later, he lived permanently in the oceans and seas of planet Earth. A Brief Review of the “Whale Transitional” Series Supposed “early” whales have little in common with hippos or living whales. The entire evolutionary sequence, from little Indohyus diving into streams, to modern cetacean-like basilosaurids took about 8 million years. With the help of computer graphics, David Attenborough gets right inside the body of the blue whale to show off its amazing mammalian anatomy. The nose shifted back onto the forehead, to make breathing while submerged easier. Whale evolution is presented in most biology textbooks as absolute fact, often with inaccurate depictions of the supposed transitional forms.1. Their fossils are only ever found in rocks that formed in shallow streams, never in the ocean, and it is likely that pakicetids were waders or bottom walkers in these streams. Unlike modern whales, basilosaurids did have external hind limbs, but these were so small that they could not bear the animal’s weight, and their function, if any, is unclear. The first known species to do this is Ambulocetus natans. A small deer like creature that lived about 48 million years ago and resembles a small deer, but was only about the size of a raccoon.The sister group of the (pakicetidae) indohyus share several characteristics with cetaceans (whales) including an unusual characteristic only found between the two species known as an Involucrum (A layer of new bone growth outside of existing bone). Pakicetus, a small predator, was like a bizarre combination of whale and wolf, a mixture that certainly worked. In eight million years, cetacean ancestors went from land mammals to obligate marine swimmers. Whale Evolution. The children observe and discuss the changes that happened as this animal evolved over many generations. Aged individuals have teeth that are worn down with use, and that tooth wear is different from that of related plant-eaters. The blue whale's shape is near-perfectly hydrodynamic, uninterrupted by hind limbs, ears or genitals. Ambulocetus’ limbs are short, the tail powerful and the snout long. It resembles crocodiles even more than pakicetids, while pakicetids had long limbs that could raise it up on land, Ambulocetus was more sprawling. Lucas Lima Staff Artist All Posts. 2000s. Everyone has heard of the blue whale, yet they are rarely seen and not often filmed. Whale Evolution and Fossils. Like Indohyus, pakicetids are only known from Pakistan and India. The shape of the vertebrae indicates that remingtonocetids do not have a fluke, but the tail vertebrae are somewhat flattened, suggesting that the tail was flat in the horizontal plane. With whales being mammals, and mammalian ancestors being land animals, whale ancestors must have lived on land too. However, have you ever stopped to consider how they came to be what we know them as today? Now, so many fossils have been found that it became possible to study evolutionary changes in great detail, allowing an unprecedented understanding of land adaptations evolving into water adaptations. Lying art. If we are able to identify some genes that are engaged in the development of multiple organ systems and that show consistent differences between cetaceans and other mammals, we may have identified the fingerprints of the process of cetacean origins. Using art CGI, this film follows the remarkable evolution of a land animal into the modern whale. A heart the size of a small family car beats 5 or 6 times a minute and drives 10 tonnes of blood through a million miles of blood vessels. http://www.eartharchives.org/articles/the-evolution-of-whales/, The Walking Whales: From Land to Water in Eight Million Years, Giant early whale Basilosaurus hunted the calves of other whales, New Zealand’s 25 million year old “Dawn Whales”, The evolution of filter-feeding in whales. While that simple concept is a platitude to 21st century readers, it was not for most people throughout human history. If evolution is true: whales are related to the even-toed hoofed mammals and should share common ancestors with them; transitional fossil forms dating from about 45 to 50 million years ago should be found which can be shown to be related to both the even-toed hoofed mammals and modern whales; whales are most closely related to modern hippos, and should share a common ancestor with them. They still had powerful fore- and hind limbs allowing them to come ashore and get around on land, and possibly hauled out for functions related to reproduction, similar to modern sea lions. The placement of the eyes is also unusual. Unlike the earlier families, this implies that protocetids were able to cross large stretches of water and were thus good swimmers. The ears had to change, since sound in water is very different from sound in air. Prothero, 2007. Protocetids are also the first whales in which the nasal opening is not near the tip of the snout, it has shifted higher up on the skull, although it is not a blowhole like it is in modern cetaceans. The evolution of the modern whale is traced back to the fossils of dogs that lived 55 million years ago, the anatomy of the animals inner ear matches that of the modern whale. That American classic was written in 1851, eight years before the publication of another classic that shook the intellectual world of its time: The Origin of Species. The evolution of whales over 4 years ago by Hans Thewissen Hans Thewissen Guest Writer All Posts. Whale Evolution Part of the Whales: Giants of the Deep exhibition. From the chemistry of the teeth, it is clear that Indohyus was a plant eater, and its dense bones suggest that they functioned as ballast, allowing the animal to stay submerged. He is the author of The Walking Whales: From Land to Water in Eight Million Years. All that's left of the back legs are two isolated hip bones buried in a mountain of muscle. Sir David's delight at the privileged close up view of one of these ocean giants as it breached right beside him is evident. Tertiary Outcrops Yielding Fossil Whales in … In looks, Indohyus may have been similar to the modern mouse deer of Africa and Southeast Asia. 5:48. However, their skulls particularly in the ear region, which is surrounded by a bony wall strongly resemble those of living whales and are unlike those of any other mammal. However, the traces of the ancestral land mammal ancestors are still retained in cetacean embryos, which have a distinct neck, with a long and narrow tail instead of a fluke, and with hind limbs that protrude from the body. This is a puzzle that is not solved and maybe Indohyus ate a kind of plant food that required processing by teeth similar to meat. Whale evolution: an example of converging lines of evidence. Gingerich is recognized as the world’s leading authority on whale evolution. It is clear that some protocetids had a tail similar to that of ambulocetids and remingtonocetids, and it is also possible that some already had a fluke. Whales have fascinated us for a very long time, and you may have studied about them with the basics or in depth. NOAA NOS/Pacific Services Center NOAA Inouye Regional Center 1845 Wasp Blvd., Bldg 176 Honolulu, HI 96818 808.725.5250 Email comments to noaasea@noaa.gov Modern-day ungulates include hippopotamus, giraffe, deer, pig and cow. Fossil evidence indicates that a nimble, deer-like mammal called Indohyus is even more closely related to whales. Whale Evolution main content. Around 48 million years ago, cetaceans moved toward the ocean. Protocetid cetaceans lived at the same time as remingtonocetids, but in somewhat different habitats. Then they returned to the sea, lost their legs and fur, but kept their lungs. Mouse deer eat fruits and leaves on the forest floor, and like to live near small streams. Evolution of Whales. They are a diverse group, with much morphological diversity. Such evolutionary changes occurred throughout the body. And all of those changes, and many others, accumulated in short succession. The dogs, the Indohyus and the Pakicetus prowled the basins of rivers and lakes throughout the Himalayas. Unlike remingtonocetids, protocetids are found in localities that indicate open, clear water, and they had big eyes. Read about our approach to external linking. Playing next. Indeed, the land ancestry of whales remained a thorny issue for the scientists, as all fossil whales, throughout the 19th and much of the 20th century showed the fully aquatic features of animals that could not survive on land. This early phase in cetacean evolution was characterized by great experimentation. The issue of whale evolution is one that is very interesting. Indohyus lived near the northern edge of the Indian subcontinent at a time when the Himalayas were just forming, and the Tethys Sea separated the Indian and Asian land masses. Where were those land ancestors, or the intermediates to life in water, creationists demanded and they made fun of the idea that whales were somehow related to cows and their even-toed relatives, calling the idea an "udder" failure. It is likely that remingtonocetids used their ears in prey detection, a feature in common with modern toothed whales. Unlike the hippo’s ancestor, whale ancestors moved to the sea and evolved into swimming creatures over a period of about 8 million years. Often, seemingly minor features provide critical evidence to link animals that are highly … Created to support the teaching of evolution and inheritance at primary level this resource contains an animation in which two children go back millions of years to look at the ancestor of the whale. The first fully aquatic cetaceans, and the group from which all modern cetaceans are derived, are the basilosaurids. From its inception, Darwinian evolution has been popularized by art. whale evolution that we would anticipate in the fossil record. However, the last common ancestor of hippos and whales goes back some 50 million years, and it did not look at all like a hippo or a whale. Even though there is an abundance of marine shells associated with the rocks that Ambulocetus is found in, it is also clear that there was freshwater nearby. Thus, over hundreds of millions they left the sea, grew legs, grew fur, and evolved lungs. It is possible that Indohyus lived similarly, and that predator avoidance was the first aquatic behavior displayed by the ancestors of cetaceans. On this second episode of ID the Future, Casey Luskin interviews Dr. Richard Sternberg, evolutionary biologist and CSC Senior Fellow, whose discussion of whale origins is featured in Illustra Media’s new documentary, Living Waters: Intelligent Design in the Oceans of the Earth. Blue whales are largest of all baleen whales and are found worldwide. by Don Batten. In addition to South Asia, protocetids also conquered the oceans, and have been found in continents from Africa to South and North America. Using cutting edge CGI, this film follows the extraordinary evolution of a land animal into the modern whale. While that simple concept is a platitude to 21st century readers, it was not for most people throughout human history. Recognizing the conundrum as one of the great challenges to his theory of evolution by natural selection, Charles Darwin took a stab at accounting for whales in the first edition of Origin of Species. Evolution designed new forms, tried them out, and discarded most of them, until at the end only the modern cetacean body plan remained. That all changed in the 1990s and 2000s, when a remarkable series of fossils was discovered: intermediate animals showing a mix of land and water features water ancestral to all modern cetaceans (whales, dolphins, porpoises). In Moby Dick, Herman Melville has his protagonist enumerate the reasons why scientists believe that whales are mammals, but then, with bold eloquence, he exclaims: “Be it known that, waving all argument, I take the good old fashioned ground that the whale is a fish, and call upon holy Jonah to back me.”. It collects food wholesale, taking in a tonne of krill-filled water with one sideways gulp. The kidneys also changed, since freshwater is not available to drink in ocean living mammals. The part of the skull that houses the remingtonocetid ear is large, suggesting that they had excellent hearing. Whale baleen. Hairs are common on the faces of small fetuses, and the nasal opening is at the tip of the nose. Some basilosaurids looked like a dolphin, and it is likely that their lifestyle resembled that of dolphins. Housed in a vast rib cage, its lungs can carry 2,000 litres of air - 500 times the human capacity. Share. Even those who were intimately familiar with the shape and behavior of whales, the whalers who hunted them, thought of whales as fish. This paper will examine mutually reinforcing evidence from nine independent areas of They may have been the first cetacean pursuit predators in open water. Browse more videos. Bear Necessities. David Attenborough's selection of memorable film moments demonstrating the leaps in filmmaking technology in the past 30 years and showcasing the diversity of life on Earth. This is the same body type present in all roughly 90 modern species of cetaceans: a streamlined body with no neck, ending in a horizontally placed triangular fluke, lacking external hind limbs and with paddle shaped forelimbs, with a skin that is mostly devoid of hair, and a nose opening that forms the blowhole on the forehead. Some other features are also indicative of more aquatic life. With such a complete fossil record, a rich diversity of modern whales and their embryos, and the powerful new molecular techniques, it may be possible to approach that question. The two major groups of living whales: Mysticetes (baleen) and Odontocetes (toothed) Blue Whale, Humpback Whale, Sperm Whale, and Killer Whale. Whale Evolution: Call it an unfinished story, but with a plot that's a grabber. It is here that cetaceans originated. Instead, they were more similar to a large dog or wolf. Various species of toothed whale are known to eat everything from numerous species of fish, squid, octopus and crustaceans to marine animals such as sharks, penguins, seals and sea lions, as well as other cetaceans such as whales, dolphins and porpoises (primarily hunted by killer whales). Report. In spite of the short limbs, the feet are large, and they were probably the organ that these animals swam with. It is indeed thought that pakicetids were ambush predators, preying on land animals coming to the water to drink, or maybe catching fish trapped in shallow water. Whales: Giants of the Deep. That feature may have helped it as its descendants became meat-eating whales. Ambulocetus is known from Pakistan, and only one complete skeleton has ever been discovered. The eyes of remingtonocetids are small, suggesting that they were less important in catching prey, and indeed, the rocks that these fossils are found in indicate that many remingtonocetids lived in swamps with muddy water. Their dentition indicates that they are meat eaters, and their eyes and ears are located high on the skull, a feature often associated with animals that have a submerged body, but are interested in things that happen out of the water, such as crocodiles spying for terrestrial prey. In fact, the tooth wear looks more similar to that of the meat-eating early whales. Watch more magic moments from David Attenborough, Watch more video clips about animal record breakers. Four million years later, it lived permanently in the oceans and seas of planet earth. The DNA evidence points to one particular artiodactyl as the closest relative to whales: the hippopotamus. There were crocodile-like whales, otter-like whales, and seal-like whales, and all these body plans were tested and then went extinct, until, in the end, only one body type was left. The first step in the evolutionary process, Indohyus had the habits of a mouse deer, a small herbivore that browsed in the undergrowth. The evolution of cetaceans is thought to have begun in the Indian subcontinent, from even-toed ungulates 50 million years ago, over a period of at least 15 million years. Be captivated, informed and inspired by the world's wildlife. In 1994, Dr. Gingerich reported finding Rodhocetus, a purported “walking whale.” It was a four-legged animal with a whale’s tail ... but this has not been communicated to the public either. The limbs lost their function in body support, but now had to work as locomotor organs in the new, dense medium. I t has been said that “a picture is worth a thousand words,” and I have no doubt that more people have been influenced to believe in evolution by artwork than by words. Whales are mammals! They had long skulls and large carnivorous teeth. Indoyus was the size of a cat, but proportionally more similar to a deer without antlers. Archaeocetes. J. G. M. ‘Hans’ Thewissen is the Ingalls Brown Professor of Anatomy at Northeast Ohio Medical University. 50 million years ago, a hungry land animal waded in shallow sea water. Examine the environmental pressures that turned a wolflike creature that hunted in shallow waters into a leviathan of the seas. Just like protocetids, basilosaurids are distributed widely across the world. Although difficult to comprehend, at 30 metres in length and 180 metric tons or more in weight, the blue whale is the largest animal ever known to have existed. The blue whale has the ability to store oxygen within the tissues of its body as well as in its blood, allowing it to stay underwater without breathing for half an hour or more. Even Darwin struggled with that concept, he proposed, in the first edition of his book, that whales might have evolved from ancestors that waded in rivers catching insects. Could it be that some changes in the genome affected several disparate organ systems simultaneously, in fact creating an evolutionary shortcut that created novel morphologies at a high rate? The trend toward more aquatic life continues, the limbs are shorter than in the earlier whales, and the tail is long and powerful. Whale Evolution: by Nature Video. Cetaceans are fully aquatic marine mammals belonging to the order Artiodactyla, and branched off from other artiodactyls around 50 mya (million years ago). In 1758, the Swedish naturalist Carl Linnaeus included this marine species in his book “Systema Naturae” setting the ground for further research on this and other cetaceans. The blue whale is the largest animal ever known to have lived on Earth. These first whales, such as Pakicetus, were typical land animals. Killer whales are the only species in the genus Orcinus. This powerful underwater hunter looked and probably behaved somewhat like a furry crocodile. It has a thick layer of blubber, in some places 20 inches thick, which helps to insulate it from the chill of the deep water. Killer Whale Ancestors. Whales are mammals! Whales, like all mammals, evolved from reptiles, amphibians, and fish. As it tilts its 100 tonne bulk downwards from the surface of the water, the whale plunges to the black world 500 feet or more below the surface. Ambulocetus was possibly coastal, still taking advantage of thirsty prey coming to drink, but also venturing out in lagoons and the surf. The next step on the evolutionary ladder are the first cetaceans, pakicetids. The relevant fossil record went from non-existent to excellent, and confirmed the molecular biologists’ finding that the closest relatives of cetaceans were indeed the artiodactyls (even-toed ungulates including cattle, deer, pigs, hippos, camels, and giraffe). It is possible that both cetaceans and hippos are derived from Indohyus or a similar species. The astounding transition came shortly after the rise of modern mammal groups, around 55 million years ago, during a hot period in the Earth’s history. It is likely that they swung this tail through the water in an up-down movement, which is of course the movement that the modern cetaceans make to propel themselves with their triangular fluke. Whale evolution is one of the most fascinating examples of evolution that there is. In it, Charles Darwin proposed that all species were descended from other species and eventually had one common ancestor. To illustrate this approach, I will present the evidence from multiple fields for the origin of the whales from terrestrial mammals. With the new fossils and DNA data, molecular biologists were also able to solve Darwin’s vexing problem of what whales are related to. Basilosaurids have the familiar attributes of modern cetaceans, they are streamlined, they have a fluke, and their forelimb is a paddle. 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