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International Zoo Yearbook > 54 > 1 > 174 - 190
International Zoo Yearbook > 51 > 1 > 232 - 247
Applied Animal Behaviour Science > 2005 > 94 > 1-2 > 149-164
International Zoo Yearbook > 54 > 1 > 174 - 190
International Zoo Yearbook > 51 > 1 > 232 - 247
Applied Animal Behaviour Science > 2005 > 94 > 1-2 > 149-164