A hyena. Hyenas were an animal species that were similar to cats and dogs. They also laughed in a similar manner that humans did. The Joker had a pet hyena named Giggles. List of Hyenas Giggles Giggler References ↑ As seen in The Pest (1977). External Link Hyena at Wikipedia Retrieved from "https://superfriends.fandom.com/wiki/Hyena?oldid=83605" Categories: Species Animal species Community content is available under CC-BY-SA unless otherwise noted.