Common Crossbills (Loxia Curvirostra) Are a Socially and Genetically Monogamous

question 17

Essay

Common crossbills (Loxia curvirostra) are a socially and genetically monogamous bird whereas Gunnison's sage-grouse (Centrocercus minimus) form leks and are polygynous. What prediction can you make about the degree of variation in male mating success in these two species?

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