Mammals (Latin: Mammalia) include humans and all other animals that feed their young with milk. Most mammals are covere…

The diameter of a snake's body does not usually exceed the size of a fist, but it can still swallow a large chicken…

As the egg-laying age approaches, the female turtle emerges from the water. It is difficult to navigate the coast looki…

Vertebrate animals have a spine, or backbone, and a cranium (brain case).  The spine is a long column of bones calle…

The blue whale is the largest animal that ever lived. An adult blue whale can measure as long as 100 feet (30 meters)…

Wherever we go in the world, we will see birds. Scientists have named about 8,600 different species of birds. Some sp…

Lizards and snakes, crocodiles and alligators, turtles and tortoises—all these vertebrates are reptiles.  Reptiles h…

Fish are vertebrates that live in water. They first appeared on the earth about 500 million years ago and were probabl…