Wooden objects for enrichment: A discussion (2000)

Eckert, K., Niemeyer, C., Anonymous et al.

Abstract

It seems that there is a general consensus that wooden objects provide inexpensive, safe, long-term and effective stimulation for the expression of non-injurious, species-typical behaviors such as perching, gnawing, gouging, manipulating and playing without causing health and hygienic problems.