Time budget of South African cliff swallows during breeding
نویسندگان
چکیده
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...
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-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...
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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...
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________________________________________________________________________________ Abstract Comparisons between production and breeding potential of different feeding systems (Concentrates, Mixed and Pastures) in South Africa were made. Data of active cows participating in performance testing as at November 2007 were used. Holstein cows numbered 68280 in 254 herds and Jersey cows 51275 in 248 her...
متن کاملDrivers of Time-Activity Budget Variability during Breeding in a Pelagic Seabird
During breeding, animal behaviour is particularly sensitive to environmental and food resource availability. Additionally, factors such as sex, body condition, and offspring developmental stage can influence behaviour. Amongst seabirds, behaviour is generally predictably affected by local foraging conditions and has therefore been suggested as a potentially useful proxy to indicate prey state. ...
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ژورنال
عنوان ژورنال: South African Journal of Zoology
سال: 1986
ISSN: 0254-1858
DOI: 10.1080/02541858.1986.11447957