The aerodynamic and mechanical effects of elongated tails in the scarlet-tufted malachite sunbird: measuring the cost of a handicap
Do simple models lead to generality in ecology?
Testosterone influences basal metabolic rate in male house sparrows: a new cost of dominance signalling?
The effects of testosterone on antibody production and plumage coloration in male house sparrows (Passer domesticus)
Testing the immunocompetence handicap hypothesis: a review of the evidence
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Ecological immunology: life history trade-offs and immune defense in birds