The Astro Tube will spin around and can be smeared with peanut butter or jelly. A 2 inch diameter PVC pipe is covered in Astroturf and has capped ends. The Astro Tube is 12 inches long and has a stainless steel eyebolt for hanging.
Solving the problem. Tennis Ball Feeder for Swamp Monkeys at Saint Louis Zoo. Such a fun idea with a Great picture where you can really see how it fits together. I would put a hinge and locks at the bottom for easier cleaning however.
Cool nest foraging enrichment. Uses a hanging planter basket. Could have hard boiled eggs or plastic Easter eggs with a small amount of egg for smaller animals, or even small paper mache eggs with egg stuffed inside. Can also use just egg shells mixed with food.
Manipulative enrichment. Download the book (free) Enrichment and Well-Being of Mammals in Captivity in English or Spanish on enriquecimiento-ambiental.gowildpanama.org Over 250 pages with detailed information and photos on the types and stages of environmental enrichment, plus a chapter on animal rights and animal welfare with tools for measuring animal welfare in captive settings.