Classification into reptile, bird or mammal game.
Reptiles, birds, and mammals are all examples of land-living (terrestrial) vertebrates, but there are a ton of differences you can make out between a scaly crocodile, and, say, a graceful peacock or a fluffy, little rabbit.
As all of them are terrestrial creatures, reptiles share a few crucial features with birds and mammals to help them survive and reproduce on land. We’ll take a look at a few similarities. All three classes are part of a group called the amniotes. The amnion, a membrane in the amniotic egg, was an evolutionary adaptation that kept developing embryos from drying out. This allowed early reptiles to lay eggs on land – a feature that was also passed down to mammals, and later on, birds. Another shared feature is called internal fertilization. Creatures with this trait reproduce with the male depositing sperm into the female’s body to develop into offspring. One other neat adaptation that birds, reptiles, and mammals share is that their feathers, scales, or skin contains a waterproofed protein known as keratin to prevent dehydration. Of course, with all these similarities, mammals, birds and reptiles still possess a lot of differences from each other. Let’s take a look at how they birth offspring. Birds lay eggs which hatch into chicks. Mammals, on the other hand, are notable for birthing live young. While most reptiles, like crocodiles and turtles, lay eggs, most snakes and lizards are viviparous – they birth live young as well. Mammalian skin also tends to have hair or fur, and their blood is warm-blooded. Mothers feed babies with their own milk. Birds have feathers, and are likewise warm-blooded. Reptiles possess scales, and they need the sun to warm their bodies, being cold-blooded. Test out your understanding of the similarities and differences among these three fascinating animal classes with our classification into reptile, bird or mammal game.