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. 

Young geologists piece together the puzzle of plate tectonics in an earth science lesson. Given a physical map of the world, they search for land formations that indicate the location of different types of plate boundaries.

This entry identifies the defining characteritics of animal evolution, including adaptation, speciation, extinction, animal parternships and natural selection.

The homeobox genes that define the basic body plan of mice and fruit flies are illustrated in this graphic from The Human Evolution Coloring Book by Adrienne Zihlman. The accompanying article describes how these genes act as "molecular...

This site from BioWeb Evolution was originally created as a ThinkQuest entry, and it has some good basic information about evolution. This page is on fossils and geologic time.

Learn about the endosymbiotic theory. This theory explains the evolution of cells from a mitochondria and chloroplast working together in a symbiotic relationship to the current cell structure.

Comprehensive reference material on ray-finned fishes, with information on their habitat, evolution, physical features, eating habits, reproduction, behavior, how they communicate, role in the ecosystem, and threats to their continuing...

Explore images and facts about the Aye Aye, including details on its evolution, appearance, habitat, breeding, diet, behaviour, and much more.

Explore images and facts about the Adelie Penguin, including details on its evolution, appearance, habitat, breeding, diet, behaviour, and much more.

Explore images and facts about the African Bush Elephant, including details on its evolution, appearance, habitat, breeding, diet, behaviour, and much more.

Explore images and facts about the African Civet, including details on its evolution, appearance, habitat, breeding, diet, behaviour, and much more.

Explore images and facts about the African Forest Elephant, including details on its evolution, appearance, habitat, breeding, diet, behaviour, and much more.

Learn facts about African Palm Civets, including details on their appearance, evolution, habitat, breeding, diet, conservation status, and predatory lifestyle.

Explore images and facts about the African Penguin, including details on its evolution, appearance, habitat, breeding, diet, behaviour, and much more.

Provides an overview of the Aldabra Giant Tortoise, including its evolution, habitat, appearance, behavior, diet, and much more. Images of this species and statistics can also be found here.

Learn facts about the Asian Giant Hornet, including details on its appearance, evolution, habitat, breeding, diet, conservation status, and predatory lifestyle.

Illustrated entry describes the Asiatic Black Bear while providing details about its evolution, habitat, physical characteristics, behavior, breeding, diet, conservation status, and more.

Explore images and facts about Baboons, including details on their evolution, appearance, habitat, behaviour, diet, conservation status, breeding, and much more.

Explore the world of the Black Bear and discover information on the physical characteristics, habitat, evolution, breeding, diet, conservation status, and behavior of this widespread bear. Includes images and statistics.

Provides an overview of the Bobcat, including their habitats, appearance, evolution, behaviour, breeding, diet, and much more. Images of this species and statistics can also be found here.

View images and learn facts about Camels, including their evolution, appearance, habitat, behavior, breeding, diet, and conservation status.

View photos and read facts about the Capybara, a large, semi-aquatic rodent, including their evolution, appearance, habitat, diet, behaviour, breeding, and conservation status.

Learn facts about Cheetahs, including details on their appearance, evolution, habitat, breeding, diet, conservation status, and how they disguise themselves from predators.

Offers images, statistics, and a summary of the Chimpanzee with details on its habitat, behaviour, diet, evolution, physical characteristics, and status as an endangered species.