A review published in the recent issue of Ethology suggests that the presence of multiple predators slows the loss of anti-predator abilities in isolated populations.
Many species find themselves isolated from predators with which they evolved. This can be natural, as on islands, or unnatural, as in zoos. In response to this isolation, many species lose the ability to respond appropriately to their predators. However, some species, despite many years of isolation, retain anti-predator behavior.
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