An empirical investigation of two assumptions of motivation testing in captive starlings (Sturnus vulgaris): Do animals have an energy budget to 'spend'? and does cost reduce demand?

Asher, L and Kirkden, R D and Bateson, M (2009) An empirical investigation of two assumptions of motivation testing in captive starlings (Sturnus vulgaris): Do animals have an energy budget to 'spend'? and does cost reduce demand? In: UNSPECIFIED.

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