Results 261 to 270 of about 158,409 (311)

Social learning in common ravens,Corvus corax

Animal Behaviour, 1999
We conducted an experiment to investigate whether the presence of a conspecific model can promote the acquisition of a motor task in common ravens. For this purpose, dyads, either of control birds or of model-observer pairings, were allowed to operate together in an arena with a set of identical boxes.
Fritz, Johannes, Kotrschal, Kurt
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Olfactory acuity in the common raven (Corvus corax)

Physiology & Behavior, 1986
The efficacy with which ravens can locate concealed carrion and similar foods has been noted from antiquity. This ability has been claimed in folklore to indicate an acute sense of smell. Contemporary opinion among ornithologists is that the sense of smell is weak at best in passerines, and particularly so in corvids which lack developed olfactory ...
A E, Harriman, R H, Berger
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Common Raven and Starling Reliance on Sentinel Common Crows

The Condor, 1975
During January, February and March, 1973 we observed interactions of three avian species on 20 days at the Montgomery County sanitary landfill near Blacksburg, Virginia. Sixty-two hours of observation at the landfill were made from the concealment of a blind located on the edge of the landfill trench.
Conner, Richard N., Prather, Irvine D., Adkisson, Curtis S.   +2 more
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Common Raven Predation on the Sand Crab

The Wilson Journal of Ornithology, 2011
Abstract We observed three Common Ravens (Corvus corax) hunting for live sand crabs (Emerita analoga) during low tide on Netarts Spit, Oregon in mid-August 2010. One raven successfully extracted four crabs in five attempts during a 5-min period. The ravens hunted on a large sandy beach near the upper margin of the swash zone (the area covered by active
Paul Hendricks, Lisa M. Hendricks
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Dispersal and Association among Common Ravens

The Condor, 1994
We examined the dispersal and gregariousness of 10 ravens from one feeding flock through daily and nocturnal monitoring for 70 days and nights over an area of approximately 5,000 km2. One of the birds took a mate and established residency within this area.
Heinrich, Bernd, Kaye, Delia, Knight, Ted, Schaumburg, Kristin   +3 more
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Vocalizations of Common Ravens in Virginia

The Condor, 1985
--I tape recorded 1,210 vocalizations and observed the behavior of Common Ravens (Corvus corax) in southwestern Virginia from 1972 through 1976. Eighteen call types were identified and observed in conjunction with behavior at a communal roost, a landfill, and nest sites.
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Age and Mouth Color in Common Ravens

The Condor, 1992
Age is a critical factor in many avian social interactions, often making it crucial in studies of social biology. Plumage, iris color, and bill color are well-known characteristics that can be used to determine age in many species ofbirds. In many corvids, all three characteristics change with age during the first two years of life, but then remain ...
Heinrich, Bernd, Marzluff, John
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Fear and Food Recognition in Naive Common Ravens

The Auk, 1995
One of the major problems an animal experiences upon reaching independence is recognizing enemies and appropriate food. Numerous studies show that specific reactions to stimuli associated with food or danger may be found in naive predators (e.g. Smith 1975, Caldwell and Rubinoff 1983, Schuler and Hesse 1985, Roper 1990).
Heinrich, Bernd, Marzluff, John, Adams, William   +2 more
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Aerial Manipulation of Voles by Common Ravens

Northwestern Naturalist, 2008
PEARSON RR, LIVEZEY KB. 2007. Spotted Owls, Barred Owls, and Late-Successional Reserves. Journal of Raptor Research 41:156-161. RICHTER KO. 1980. Movement, reproduction, defense, and nutrition as functions of the caudal mucus in Ariolimax columbianus. Veliger 23:43-47. ROSENBERG DK, SWINDLE KA, ANTHONY RG. 2003.
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Temperature regulation in the common raven of interior Alaska

Comparative Biochemistry and Physiology Part A: Physiology, 1978
Abstract 1. 1. Metabolic and thermal responses to ambient air temperatures ranging from +35 to −80°C were measured in common ravens (Corvus corax principalis) acclimatized to summer and winter near Fairbanks, Alaska, U.S.A. 2. 2. Metabolic rates were not significantly different between summer and winter at any of the test temperatures. 3.
Mark W Schwan, Darrell D Williams
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