The Hyenas (also called the Evil Hyenas) are a group of spotted hyenas that work for Claw and supporting antagonists of Pet Story. They serve as the secondary antagonists of the Zoo Ending.
Before the events of the Zoo Ending, the hyenas were presumably freed from their habitat by Claw possibly because the lion wanted to rule the Zoo and harm other animals, as seen by their habitat in which the entrance there was opened before fighting the Claw. After being freed, the Hyenas worked under Claw's orders to help him rule the zoo.
The hyenas were first mentioned by Shellie to the players and Canela about the trouble they were causing at the zoo, and would offer them a ride there before the protagonists returned home. Once at the zoo, they are seen ganging up on a group of defenseless turtles. However, when the players get there, they immediately respond by fighting them, but are defeated. One hyena who didn't participate though, said to wait until what Claw finds out about their actions. Afterwards, the players can see a group of other hyenas in their habitat and can go inside to collect treats, although the hyenas there won't harm the players. After Claw's defeat, the hyenas were left leaderless and presumably backed out to their habitat never to harm any zoo animals ever again.