Do Herring Gulls (Larus argentatus) invest more in offspring defence as the breeding season advances?
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Kilpi, M. (1987). Do Herring Gulls (Larus argentatus) invest more in offspring defence as the breeding season advances?. Ornis Fennica, 64(1), 16–20. Hämtad från https://ornisfennica.journal.fi/article/view/133223