Food puzzle device simulating termite fishing for captive chimpanzees (Pan troglodytes) (1989)

Maki, S., Alford, P. L., Bloomsmith, M. A. et al.

Abstract

Significant reductions of abnormal behavior and significant increases in activity occurred with the pipe feeder's availability. Species-typical tool-using activity occurred, and the use of the pipe feeder increased subjects' foraging and feeding activity toward more species-normative levels. In the corral-housed groups of nine to 12 animals, competition for use of the single pipe feeder appeared to induce aggression, with 47 attacks recorded in the groups when the filled feeder was present and none recorded .. prior to the use of the feeder. ... Multiple puzzle devices should be available to group-housed animals to preclude undesirable aggression arising from competition.