Bill Nye introduces reptiles and explains how they are able to live in different environments around the world by regulating their own body temperature. As cold-blooded organisms, they don't keep the same body temperature throughout the day.
In less than two generations, population sizes of vertebrate species have dropped by more than 50 percent. According to 2014's Living Planet Report, this means we have lost over half of our birds, amphibians, reptiles, fish, and mammals.
Scientists at Jurassic Park dig up a fossil and use a computer to identify that it is a velociraptor. They note certain characteristics of its bone structure and suggest it shares more in common with present-day birds than it does with reptiles.