Gray, G. 1988. Guinea pigs. Humane Innovations and Alternatives in Animal Experimentation 2, 48-49.

Initial attempts to provide the animals a covered area for refuge showed that the guinea pigs adopted the shelter very quickly and would dart under cover when startled. ... We soon realized that this was a most useful behaviour when it came to catching the animals in these large bins. We constructed boxes which measure 61cm x 42cm x 30cm and have a floor and a removable top.