ML585137951
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תאריך
מיקום
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פרטי השורה
Reasonable count for the limited area on which we focused. Some fledged young. Audio recordings include adult vocalizations, nestlings, and recently fledged young. "Body is fully covered by feathers at time of nest departure, but flight feathers are still partly ensheathed; flight is not possible. Until day 8, nestlings give low, quiet buzzes in conjunction with gaping when disturbed or when adults appear at nest rim. Thereafter, reaction to disturbance changes to a crouch or sometimes to escape by rapid running and jumping. Running capability develops by day 7. By this time, birds frequently engage in preening and stretching, are quite active, and if hungry, enthusiastically respond to attending parents." Renfrew, Rosalind, et al., Bobolink (Dolichonyx oryzivorus), version 1.0. Birds of the World.
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