Will's Skull Page - Photos and measurements of skulls of mammals, reptiles, and birds. Illustrated species lists and keys, instructions on preparation.

Museum of Vertebrate Zoology Collections - Searchable database of specimens, including over 50,000 tissue samples for use in molecular analyses.

Cornell University Museum of Vertebrates - A major educational and research resource with more than 1.5 million specimens. Sections on ichthyology, herpetology, ornithology, and mammalogy.

UC Berkeley: Museum of Vertebrate Zoology Data Access - Provides access to data and images in the collections.

Infrared Zoo - Uses infrared photography to show the differences between warm and cold blooded animals and how animals use fur, blubber, and feathers to insulate themselves.