Are you a vertebrate or invertebrate? Vertebrates are animals with a backbone, so I guess that makes us all vertebrates. But wait a second, I thought humans were mammals? We are! Join us in this video as we learn to classify animals. There are so many different animals in our great, big world, so we've grouped them together based on similar characteristics. If you could be an animal, would you be a reptile, bird, fish, amphibian, or mammal? I'd be an invertebrate spider, of course.