The Prey center, set up by Clay, is a large cave open to the sky on one side (with this side covered by a wall of rocks to prevent the prey from escaping). It was often described as chaotic due to students and animals running around yelling, shouting, catching prey, or eating. It is usually filled with animal prey with a pile of fish hunted by expeditions, and a pile of rainforest fruit for RainWing students. It can be accessed through corridors leading from the residents' sleeping caves. (All of this is from the Wings of Fire Wiki)
(All of this is from the Wings of Fire Wiki)