Van den Broek, F. A. R., Klompmaker, H., Bakkere, R. et al. 1995. Gerbils prefer partially darkened cages. Animal Welfare 4, 1
Little is known about housing requirements of gerbils. ... The ten animals included in the [preference] test spent most of their time in the cages that were darkened by 50 and 75 per cent, thus...