'Fatal attraction': Small carnivores drawn to kill sites, then ambushed by larger kin

MARCH 18, 2020

by University of Washington

In many parts of the world, there is an imbalance in the food chain.

Without top predators such as wolves and grizzly bears, smaller meat-eating animals like coyotes and foxes or grazers such as deer and elk can balloon in population, unchecked. This can initiate more deer-vehicle collisions, scavenging by urban coyotes and other unnatural human-animal interactions.

University of Washington researchers have discovered that large predators play a key yet unexpected role in keeping smaller predators and deer in check. Their "fatal attraction" theory finds that smaller predators are drawn to the kill sites of large predators by the promise of leftover scraps, but the scavengers may be killed themselves if their larger kin return for seconds.

The study, published March 18 in the journal Ecology Letters, is the first to examine carnivore killing and scavenging activities in relation to each other across dozens of landscapes around the world. Patterns that emerged from their analysis could be used to make important management decisions about large carnivores worldwide, the authors said.

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