Poenisch, T. 1992. Bedding for enrichment. The Newsletter 4(1), 1.

When forage materials [chicken scratch] are provided, bedding materials, such as straw or shredded newspaper, along with woodchips increase the amount of time the captive chimpanzee spends in search of forage materials. ... Whether this be the normal time for evening nesting or the novelty of the fresh materials, most chimpanzees can be seen preparing a new nest immediately following the receipt of the newspapers.