Chinchillas eat bark in the wild, so there is nothing wrong with providing some wood for your pet to nibble on. That said, some woods are safe and some are not. Before you give your chinchilla wood to chew on, be sure that is safe. Bamboo, cottonwood, dogwood, elm, hazelnut, mulberry, untreated and dried pine, and willow are all safe. Almond, beech, birch, cashew, chestnut, citrus woods, elderberry, eucalyptus, firs, maples, oaks, treated or fresh pine, pine cones, sycamore, walnut, and yew are all unsafe. Never give processed wood to a chinchilla.