Circuses.com - Factsheets, Kids' Corner, the animals, circus travel schedules, description of the unnatural lives circus animals live, and what you can do. Part of the PETA family of sites.
HSUS - Circuses - Collection of articles with reasons to oppose circuses using wild animals. From Humane Society of the United States. Washington DC, US.
IDA - Circus Facts - Travel, pain and public safety issues. From In Defense of Animals. California, US.
Outlaw the Animal Circus - Outlines incidents of circus animal cruelty, undercover investigations, photo gallery and a campaign to ban the exhibition of animal circuses. Based in Australia.
Stop the Circus Cruelty - Online resource center dedicated to the campaign of banning the use of animals in circuses. USA.
