We have now completed our study of every single animal phylum but one: Chordata. This is the one that contains humans, as well as the most common animals we interact with every day, like our pets. There are about 81,600 species of...

Here we explore interesting facts about Electric Rays, cartilaginous ray-fish that can generate up to 200 V of electricity to attack their prey or defend against predators.<br/>

Biological Classification Set: This clip introduces the eight classes of animals that make up the subphylum vertebrata.