title: [Comments on the exchangeability of herring-gull chicks (Larus argentatus) after the 1st week of life].
abstract: In the Biville chalk cliff area the Herring gulls nest both in slope and ground colonies and on cliff ledges. Like the Kittiwake (CULLEN 1957), the cliff-nesting pairs still accept other chicks after the 1st week of life. Gulls in slope and ground colonies, however, attack those chicks older than 4 days in close proximity to their nests (TINBERGEN 1936).
mesh_terms: D000367:Age Factors; D000818:Animals; D001522:Behavior, Animal; D001717:Birds / Q000502:physiology*; D005260:Female; D008425:Maternal Behavior
vernacular_title: Bemerkungen zur Austauschbarkeit von Küken der Silbermöwe (Larus argentatus) nach der ersten Lebenswoche.