This document provides an overview of the animal kingdom by categorizing animals into vertebrates and invertebrates. Vertebrates include mammals, birds, amphibians, fish, and reptiles which all have backbones, while invertebrates do not. Within these groups, details are given about characteristics of different types of animals such as mammals drinking milk from their mother, birds having feathers, fish living in water, and worms being able to enter people's bodies. Adaptations like talons, blubber, and camouflage are also mentioned.