Are spiders related to crabs? Study the order of arthropods with a reading selection about animal diversity. It provides details about each class within the order, as well as vivid pictures and explanatory charts. 

Use this illustrated overview of invertebrates for review.

Find out about some the most simple organisms in the Animal Kingdom, the sponges.

The animal kingdom and its classification are explained and broken down into vertebrates and invertebrates in this resource. "Best-of" the animal kingdom list given - fastest, smallest, largest, strongest and more.

The highest category of taxonomic classification is the kingdom. This website from Palomar College presents the five kingdoms in an easy-to-read chart and discusses the Animalia and Plantae kingdoms in depth. After reading through the...

Learn about the animal kingdom including an in-depth look at body characteristics, reproduction, types of cells, ways they obtain food, and evolutionary relationships. Many illustrations and nine interactive activities are included.

What do centipedes and crabs have in common? What's so special about a backbone? Check this site out from The Franklin Institute if you are interested in biology and classification.

Wikipedia offers detailed information on insects, invertebrate animals of the class Insecta.

Short introduction to animals explains the important traits that all animals share and the differences between vertebrates and invertebrates.

This site gives an in-depth description of coral, including its behavior, appearance, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a jellyfish, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a nautilus, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of an octopus, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a snail, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site from the Canadian Museum of Nature, a natural history museum, provides short information blurbs and fun facts on over 240 different common animals categorized by type (mammals, fish, reptiles, invertebrates, amphibians,...

This site gives an in-depth description of a earthworm, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a clam, including its appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a giant squid, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives a brief description of a giant clam, including its behavior, appearance, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a flatworm, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives a brief description of a leech, including its behavior, appearance, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a mussel, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of an oyster, including its behavior, appearance, reproduction, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.

This site gives an in-depth description of a roundworm, including its behavior, appearance, and classification. The site includes photos and illustrations and an interactive quiz to test your understanding.