Chimpanzees are highly complex and intelligent animals.
Each chimpanzee has uniquely individual personalities, preferences and other personal traits. Close association between many aspects of chimpanzee and human societies have been noted. As with all of the Zoo animals, stimulating enrichment materials are regularly provided to Bill for interest and fulfillment. One noteworthy enrichment that he has recently been associated with was the production of watercolor paintings such as this example. His watercolors have received some enthusiastic responses from critics .