Performance on a categorisation task suggests that removal of environmental enrichment induces 'pessimism' in captive European starlings (Sturnus vulgaris)

Author: Bateson M   Matheson SM  

Publisher: Universities Federation for Animal Welfare

ISSN: 0962-7286

Source: Animal Welfare, Vol.16, Iss.2, 2007-05, pp. : 33-36

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Abstract