... for correspondence (e-mail: [email protected] 8 7 2002 © The Company of Biologists Limited 2002 2002 ultraviolet UV colour perception European starling Japanese quail bird vision avian Colour vision enables objects, or regions of objects, to be identified from...

... the perception of polarizational false colours by Papilio butterflies was previously demonstrated with artificial, strongly colour-saturated and totally linearly polarized stimuli, we expect that the weak polarization sensitivity of Papilio photoreceptors hardly influences colour perception under natural...