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Irruptive migration is mostly observed in species specialized on pulsed resources and is thought to be a response to… Expand Bone remains of birds from a location of the middle Subboreal period and from three locations of the early Subatlantic period… Expand The karyotypes of 39 avian species new to cytology are described, viz. Pelecanus crispus, P. occidentalis and Morus bassanus… Expand Snowshoe hare (Lepus americanus) have important community-level roles throughout their range as prey for numerous species of wide… Expand This is a retrospective study on wild raptors submitted to the Universitéde Montréal (Quebec, Canada) from 1989 to 1996… Expand Two juvenile snowy owls (Nyctea scandiaca) died after short episodes of lethargy and anorexia. Postmortem examination of the… Expand During the examination of 182 owls--Asio otus (51), Strix aluco (44), Bubo bubo (34), Nyctea scandiaca (15), Athene noctua (14… Expand A total of 69 great horned owls (Bubo virginianus) and 16 snowy owls (Nyctea scandiaca) collected in Alberta from 1971 to 1974… Expand Many investigations of pineal function have been conducted on animals experiencing artificial laboratory environments. The use of… Expand