You have reached phylum level. Phylum Chordata includes the red squirrel, and every other vertebrate animal (vertebrates are 'chordates'). We have cut out all invertebrates - there are no insects, crustaceans, or worms - just vertebrates (like mammals, fish, reptiles, amphibians and birds). There are around 26,000 species of vertebrates alive today.
Click on another of the groupings to the left of the illustration or return to the Main page to learn more about classification.