Winter foraging at carcasses by three sympatric corvids, with emphasis on recruitment by the raven, Corvus corax

  title={Winter foraging at carcasses by three sympatric corvids, with emphasis on recruitment by the raven, Corvus corax},
  author={Bernd Heinrich},
  journal={Behavioral Ecology and Sociobiology},
  • B. Heinrich
  • Published 1 September 1988
  • Environmental Science
  • Behavioral Ecology and Sociobiology
SummaryLarge animal carcasses provide a highly clumped rich source of food for ravens that should be worth defending, yet in the forests of Maine and Vermont ravens commonly feed in groups. Ravens discover baits flying singly or in pairs, but after a bait is discovered they usually arrive in groups. In contrast, the maximum number of blue jays and crows eventually attending a bait is close to those discovering it. Unlike in crows and jays, two patterns of bait use are seen in ravens: baits are… 
Rich Pickings Near Large Communal Roosts Favor ‘Gang’ Foraging by Juvenile Common Ravens, Corvus corax
This work adapts a general model of juvenile common raven foraging behavior to show formally how the trade off between search efficiency and social opportunity can account for the existence of the alternative social foraging tactics that have been observed in this species.
Common ravens, Corvus corax, preferentially associate with grey wolves, Canis lupus, as a foraging strategy in winter
It is shown that ravens preferentially associate with wolves in both the presence and absence of food, resulting in the discovery of carcasses and suppression of ravens' innate fear of novel food sources.
Social scavenging by wintering striated caracaras (Phalcoboenus australis) in the Falkland Islands
It is found that food obtained per individual was greater toward the beginning of carcass availability, when competition was fierce; that vocalizations, by birds at and approaching the carcass, preceded periods of faster group formation; and that on average birds would approach a speaker playing conspecific calls more closely than one playing a control recording.
Experimental Evidence That Scare Tactics and Effigies Reduce Corvid Occurrence
Abstract Common Ravens (Corvus corax) and American Crows (C. brachyrhynchos) are important predators of eggs and chicks of the Snowy Plover (Charadrius nivosus), which compromises population recovery
Winter population dynamics between the Eastern Wolf (Canis lycaon) and the Common Raven (Corvus corax) in Algonquin Park, Ontario
The eastern wolf (Canis lycaon) is important to the Algonquin Provincial Park ecosystem through its top-down influences on the food web. While previous research in Yellowstone National Park has shown
Scrounging Tactics in Free‐Ranging Ravens, Corvus corax
Social foraging allows individuals to scrounge, i.e. to exploit the food others have made available. The conditions promoting scrounging as an alternative foraging tactic have yet received limited
Decision time modulates social foraging success in wild common ravens, Corvus corax
Investigating which factors underline kleptoparasitism avoidance is a promising scenario to test specific predictions derived from these hypotheses and concludes that individuals benefit from applying cognition to such decision‐making, independently of age class.
Common Myna Roosts Are Not Recruitment Centres
The recruitment centre hypothesis did not hold in the study population of mynas, and flock sizes were smallest at the feeding site and larger in the evening than in the morning, but did not coincide with predator activity, information transfer unrelated to food may possibly give rise to the evening aggregations.
Winter Ecology and Spring Dispersal of Common Ravens in Wyoming
Abstract. Numbers of Common Ravens (Corvus corax) have increased in western North America, and these high abundances are the source of problems throughout the species' range. Little is known about


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Examination of the stomach contents of 18 adult and 66 nestling birds, collected in the vicinity of Lake Malheur Reservation in southeastern Oregon from June 1 to 23, reveals food preferences of ravens in this general locality for the month of June, namely, birds and birds' eggs.
Aspects of the ecology of the common raven in Harney Basin, Oregon
Common Ravens (Corvus corax L.) have been implicated as significant predators on the eggs of waterfowl and shorebirds on Malheur National Wildlife Refuge. Malheur Refuge, located in southeastern
Competitive interactions within and between species in a guild of Avian scavengers
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Some winter and nesting season foods of the common raven in Virginia
The objectives of the research were to determine the food habits of Common Ravens in Virginia during two critical periods of the yearwinter and the nesting season, and the importance of garbage dumps as a food source.
Recruitment to food in black vultures: evidence for following from communal roosts
Diet Selection and Optimization by Northwestern Crows Feeding on Japanese Littleneck Clams
Data clearly show that crows not only feed selectively on large clams but that their selectivity results in a net energy intake rate close to the maximum attainable.
Group foraging by a coral reef fish: a mechanism for gaining access to defended resources
  • S. Foster
  • Environmental Science
    Animal Behaviour
  • 1985
The Florida scrub jay : demography of a cooperative-breeding bird
It is found that habitat restraints, rather than kin selection, are the main source of the behavior of Florida Scrub Jays: the goal of increasing the number of close relatives other than descendants in future generations is of relatively minor importance in their cooperative-breeding behavior.
Coadaptations of the Clark's nutcracker and the pinon pine for efficient seed harvest and dispersal.
Clark's Nutcracker (Nucifraga columbiana) is one of four species of corvids that commences harvesting, transporting, and caching the seeds of pinon pine (Pinus edulis) in mid—August. Caching
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