Do cuckoos effectively mimic their hosts? Here it is assessed from a host perspective whether the colour design of cuckoo eggs of different races maximizes matching for two favourite avian hosts.

Secondly, it is assessed the role of nest luminosity on host perception of matching.

Results revealed that cuckoo races as assessed by humans do not entirely match with host perception of matching and that achromatic mechanisms could play a main role on discrimination of cuckoo eggs at low light levels.

Proceedings of the Royal Society B: Biological Sciences

Proceedings B is the Royal Society's flagship biological research journal, dedicated to the rapid publication and broad dissemination of high-quality research papers, reviews and comment and reply papers. The scope of journal is diverse and is especially strong in organismal biology.

www.publishing.royalsociety/proceedingsb

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