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Blue tits are ultraviolet tits .
Proceedings of the Royal Society, Series B 265, 451-455. Ultraviolet plumage colours predict mate preferences in starlings. Proceedings of the National Academy of Sciences U.S.A. 94, 8618-8621. Ultraviolet vision and band colour preferences in female zebra finches, Taeniopygia guttata. Animal Behaviour 54, 1383-1392.