Crocodiles, which are the closest living relatives of dinosaurs, are thought to be the ancestors of many different dinosaurs. In crocodiles, both atria and both ventricles are completely separate. They use their strong tails to swim and help them move around on land. The nasal disc on the tip of the snout contains two nostrils, each with a protective valve or flap at their opening. The coccyx currently serves as an anchor for muscles; that wasn't its original purpose, so that's why it's considered vestigial. This appears to be yet another adaptation to assist in pinpoint orientation of potential prey. In today's video we explain how homologous, analogous, and vestigial structures provide evidence of evolution. Nests are constructed so that the eggs will be above the high-water mark because crocodilian eggs cannot survive flooding for more than 12 hours. The delicate eyeball surface is thus protected under the water, while a certain degree of vision is still possible. Evolution sometimes develops new traits in the creature. To protect these animals, it is critical that they are not killed for their skins. Vestigial Organs - Definition, Features, Importance, Examples, and FAQs Adults feed mostly at night on fish, crabs, turtles, snakes, and small mammals. SuperCroc lived in what is now the Sahara region around 110 million years ago, when forests were in place. Tags: The hatchlings rapidly disperse from their nest and fend for themselves. Crocodiles swallow stones roughly the size of a dime, regardless of their size. Crocodile teeth are not distinguished based on their species. The cloacal vent is slightly posterior to the attachment of the hind legs at the base of the tail. Three of these animals skins are slaughtered for their skin. The digestive enzymes in the stomach are particularly strong, and most bones and flesh are rapidly digested. d. Beetles share a common ancestor with moths. It allows blood to bypass the lungs when the animal is submerged, and this structure has the effect of stabilizing blood oxygen levels. Homologies: Vestigial structures - Understanding Evolution An unusual feature of crocodilians is the tendency for them to retain hard, indigestible objects, such as stones, in the stomach.
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