Enrichment comes in many shapes and sizes. We give the chimps gum from time to time, because not only is it good for the chimps’ teeth (we try to stick to Spry Brand gum, which has Xylitol in it- a natural sweetener that is also good for your teeth), but it gives them something interesting to do. Some of the chimps choose to just swallow their gum right away, but others like to chew and even play with their gum.