The influence of group size on vigilance in captive-raised Ring-necked Pheasants
Article Abstract:
A study was conducted to determine the effect of group size on the vigilance behavior of Ring-necked Pheasants (Phasianus colchicus) who had been raised in captivity. Wild pheasants were captured and kept under observation in an aviary in Saskatchewan, Canada, in 1990. Pheasants raised in captivity demonstrated higher susceptibility to predator attacks when freed into the wild. Pheasants in large groups, spent less time scanning for predators than solitary pheasants. The vigilance behavior of pheasants was also influenced by sex and age differences in the group.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
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Do free-ranging Common Nighthawks enter torpor?
Article Abstract:
The ability of free-ranging Common Nighthawks to enter torpor was evaluated. Nighthawks were captured by mist nets from the vicinity of Okanagan Falls in British Columbia and were subsequently weighed using an electronic balance. Thehawks' skin temperature was checked and recorded every 20 minutes between sunset and sunrise to determine the onset of torpor. Results revealed that Common Nighthawks are not physiologically adapted to enter torpor as a means ofenergy conservation.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1993
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Individual and intersexual variation in alarm calls of the White-tailed Hawk
Article Abstract:
The individual andintersexual variations in the vocalizations of White-tailed hawks were studied.Alarm calls from six resident breeding adult hawks at the Attwater Prairie Chicken National Wildlife Refuge were recorded for a duration of five days. Sonograms of the recorded calls are then generated and measured using a computer software package. Results reveal strong variations in the individual and intersexual calls of the White-tailed Hawks.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1993
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