The volume size of the accessory olfactory bulb (AOB) of 40 common tree shrews (Tupaia glis) was compared with regard to differences between left and right sides, males and females, and animals born in the wild and those born and raised in captivity. There were no statistically significant differences between the two sides and the two sexes, but a significant reduction of the AOB from wild to captive animals was apparent. This reduction was more pronounced in females than in males and somewhat more pronounced in the inner granular layer (layer 6) than in the other measured components (layers 1 + 2, layers 3–5). No well-founded explanation for this reduction could be give
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