Animal Defenders International (ADI) is an American major international campaigning group, with offices in London, Los Angeles, and Bogota, who lobby to protect animals on issues such as animals in entertainment and their use in experiments, worldwide traffic in endangered species, factory farming, pollution, and conservation. The organization has been involved with several international animal rescues, funding both the relocation and rehoming of circus lions, tigers, chimpanzees, and other animals, and has become a major force for animal protection, succeeding through its undercover investigations in securing legal protection for animals.