Avian plumage and eggshell colouration covary with sex-specific contributions to nest building

Jenő Nagy, Mark E. Hauber & Mark C. Mainwaring
Interspecific variation in sex-specific contributions to nest building remain poorly understood. We examine whether the colouration of parents and of eggs influences sex-specific nest building contributions in 521 species of Western Palearctic birds. Having colourful plumage and laying colourful eggs are costly because of the deposition of pigments (in feathers and eggs) and/or forming costly nanostructural substrates (of feathers). We tested the hypotheses that species in which females alone build nests (i) exhibit sexual plumage...
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5 downloads reported since publication in 2021.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?