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A comparison of the biology of the normal and bridled forms of the Common Guillemot Uria aalge at a single colony
Harris M.P., & Wanless, S. (1986) J. Zool. (Lond.) 210(1):121-130
The proportion of Guillemots on the Isle of May showing bridling has remained constant for 49 years. Although clumping of birds occurred, there was no obvious assortment of sexes. We detected no systematic differences in the breeding of bridled and normal individuals.

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