Showing papers by "Keith A. Hobson published in 1988"
TL;DR: Naive parental yellow warblers were tested with a mounted eastern grey squirrel during the nest-building, egg-laying, incubation and nestling stages of the nesting cycle, finding that age, clutch or brood size, and nest success were not correlated with the intensity of nest defence.
63 citations
TL;DR: Chicks in fledgling creches entered the ocean, swam, dove, bathed, and returned to these creches where they were fed by adults up to and beyond the time when they could fly.
Abstract: Creching behavior of Brandt's Cormorant (Phalacrocorax penicillatus) chicks was studied at Southeast Farallon Island, California, in July and August 1984. Three stages of creching were described: (1) nest-site creches involved small chicks (10 to 25 days old) from adjacent nests huddling on nest sites before and just after parents stopped continuous attendance of chicks; (2) subcolony creches involved medium-sized chicks (over 20 days old) standing together between nest sites and on the periphery of natal subcolonies; and (3) fledgling creches involved large chicks (over 25 days old) from several subcolonies standing together outside of subcolonies and nearer to the ocean. Nest-site creches occurred mainly at night and probably have a thermoregulatory function. Fledgling creches occurred throughout the day and night and may facilitate fledging behaviors. Chicks in fledgling creches entered the ocean, swam, dove, bathed, and returned to these creches where they were fed by adults up to and beyond the time when they could fly.
25 citations