The Basic Invertebrate Groups
Approximately 97 percent of all known animal species are invertebrates. Many of these species are classified in one of eight basic groups. This article explores looks at eight groups of invertebrates, their characteristics and the types of animals that belong to each group.
Facts About Invertebrates
Learn interesting facts about invertebrates and find out about their diversity, evolutionary history and the characteristics make them different from other animal groups.
Invertebrates are animals that lack a backbone. This profile explores basic facts about invertebrates including how they are classified, what they eat, where they live and the characteristics that make them different from other animal groups.
A Guide to Vertebrates and Invertebrates
Among the most basic criteria by which animals are sorted is whether or not they possess a backbone. This single trait places an animal into one of just two groups: the vertebrates or the invertebrates.