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Choosing the right mate is crucial for successful breeding, particularly in monogamous species with long and extensive bi‐parental care, and when the breeding pair is presumed to last many seasons. We investigated the degree of assortative mating in the Little Auk Alle alle, a long‐lived seabird with long‐term pair bonds and bi‐parental care for fixed (morphological) and labile (physiological, behavioural)...
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