منابع مشابه
The mechanics and behavior of cliff swallows during tandem flights.
Cliff swallows (Petrochelidon pyrrhonota) are highly maneuverable social birds that often forage and fly in large open spaces. Here we used multi-camera videography to measure the three-dimensional kinematics of their natural flight maneuvers in the field. Specifically, we collected data on tandem flights, defined as two birds maneuvering together. These data permit us to evaluate several hypot...
متن کاملVariation in age composition among colony sizes in Cliff Swallows.
Variation in group size is characteristic of most social species. The extent to which individuals sort among group sizes based on age may yield insight into why groups vary in size and the age-specific costs and benefits of different social environments. We investigated the age composition of Cliff Swallow (Petrochelidon pyrrhonota) colonies of different sizes over 18 years at a long-term study...
متن کاملRecognition of Parents' Voices by Young Cliff Swallows
-Cliff Swallow (Hirundo pyrrhonota) chicks were played calls of parents and unrelated (control) adults at 9 and 18 days of age. Younger chicks showed no difference in the frequency of their antiphonal begging calls to parental vs. control calls. The older, nearfledging chicks, however, responded significantly more to parental calls than to control calls: 78% of their total antiphonal calls were...
متن کاملSpatial and temporal unpredictability of colony size in Cliff Swallows across 30 years
Most colonially breeding animals occupy colonies that range in size from a few pairs to thousands of individuals, but the causes of colony size variation are largely unknown. Three general hypotheses are: (1) that variation in colony size is maintained by fluctuating selection via spatial and temporal changes in fitness associated with different colony sizes; (2) that colony formation reflects ...
متن کاملCliff swallows, swallow bugs, and West Nile virus: an unlikely transmission mechanism.
The cliff swallow (Petrochelidon pyrrhonota) could play an important role in the transmission of West Nile virus (WNV) because of its breeding ecology, reservoir competence status, and potentially high natural exposure rates. Cliff swallows nest within colonies and their nests are occupied year-round by swallow bugs (Oeciacus vicarius), hematophagus ectoparasites that feed primarily on cliff sw...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 2015
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay308