The seagrass, water hyacinth, and rattan Niteangel Trio of Fun Balls are a blast to roll and chew, especially when packed with hay. Lightweight balls made from natural materials like willow or seagrass can satisfy both a rabbit’s desire to play and their instinct to chew. Playful bunnies will nudge and roll balls for entertainment and some even grasp the concept of fetch, said Chris Ratches, Bunny House team lead at Best Friends Animal Sanctuary in Kanab, Utah. Balls with a loose weave can be stuffed with grass or hay to encourage healthy chewing and even the balls themselves make for good nibbling.