Schmidt, E. M., Dold, G. M., McIntosh, J. S. 1989. A perch for primate squeeze cages. Laboratory Animal Science 39, 166-167.

Modification of single squeeze-cages is described allowing the installation of a perch that does not interfere with the normal operation of the cage. The monkeys make use of their perch for feeding, grooming and sleeping for 30% to 95% of the day.