Plumage colour (t = 3.03, P = 0.005) was the only variable that remained significant in the in the global model although flock size (t = −1.79, P = 0.08) and incubation period (t = 1.79, P = 0.08) approached significance.
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Immune investment is explained by sexual selection and pace-of-life, but not longevity in parrots (Psittaciformes).
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