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Related Experiment Video

Updated: May 20, 2025

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Published on: August 8, 2017

Dining with wolves: Are the rewards worth the risks?

Summer N Richman¹, Diana F Tomback¹, Nels Grevstad²

¹Department of Integrative Biology, University of Colorado Denver, Denver, Colorado, United States of America.

|March 24, 2025

Summary

This summary is machine-generated.

Common ravens and black-billed magpies successfully scavenge food from gray wolves (Canis lupus) at sanctuaries. This foraging strategy poses low risk to the birds, despite varying wolf reactions and temperature effects.

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Last Updated: May 20, 2025

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Area of Science:

Wildlife Ecology
Animal Behavior
Ornithology

Background:

Common ravens (Corvus corax) and black-billed magpies (Pica hudsonia) are known to scavenge at wild gray wolf (Canis lupus) kills in North America.
Interactions between these corvids and wolves in managed sanctuary settings, particularly regarding foraging success and risks to birds, are poorly understood.

Purpose of the Study:

To investigate the association between common ravens and black-billed magpies with gray wolves during feeding times in enclosures.
To quantify the proportion of birds obtaining food, assess wolf behavioral responses, and determine if birds incurred injuries.
To examine the influence of food type, quantity, and ambient temperature on bird presence and foraging success.

Main Methods:

Observations were conducted during daily feeding tours across 20 visits to eight wolf enclosures at a Colorado sanctuary.
Wolf-bird interactions were categorized (chasing, ignoring, food removal), and bird numbers and foraging success were recorded.
Statistical analyses examined relationships between environmental factors (temperature), food variables, and bird numbers/behavior.

Main Results:

An average of 33% of ravens and 43% of magpies obtained food within enclosures.
Most wolves exhibited neutral or ignoring behaviors towards the birds, though individual responses varied.
No effect of food type was found, but higher food amounts showed a trend for increased raven foraging.
Raven numbers negatively correlated with higher temperatures, while magpie numbers positively correlated with lower minimum temperatures.

Conclusions:

Corvid scavenging at wolf enclosures is a successful foraging strategy with minimal risk.
Environmental factors like temperature significantly influence the presence of ravens and magpies.
Wolf tolerance and consistent food availability contribute to the low-risk foraging opportunities for these birds.