Vertebrates are a group of animals with backbones or vertebral columns that protect their nerve cords. As of 2015, there are about 57,000 species of vertebrates alive today, though this number only amounts to about 3 per... More »

The Okefenokee swamp is the largest swamp in North America. It covers approximately 700 square miles in the southeastern corner of Georgia and is home to more than 400 species of vertebrates, including more than 200 type... More »

Ten facts regarding gravity starts with the initial set of theories developed by Isaac Newton in 1665 that were supposedly inspired by his observation of a falling apple. Any human or object on the surface of Earth is al... More »

www.reference.com Science Physics Motion & Mechanics

Reptiles are a class of vertebrates – animals with backbones or spines – that are cold-blooded and covered with scales. The four groups of reptiles are snakes and lizards, turtles and tortoises, alligators and crocodiles... More »

www.reference.com Pets & Animals Reptiles

The main difference between vertebrates and invertebrates is that vertebrates have backbones as part of their endoskeletons, whereas the anatomy of invertebrates lacks this feature. Another difference is that vertebrates... More »

www.reference.com Science Biology Zoology

Animals with backbones are called vertebrates, and all vertebrates have a well-developed brain and a living endoskeleton, among other things. An endoskeleton is one that is made from bone or cartilage and grows and survi... More »

Most animals without backbones, known as invertebrates, have no tails. Among these are spiders, most insects and frogs. However, every species of mammal has a tail at some point in its development. Human embryos possess ... More »