Abstract
At 22 wetland localities in SW Sweden, breeding densities of two passerines, Yellow Wagtail and Meadow Pipit, were higher within Lapwing territories than outside them. Earlier studies of predation on artificial nests have shown that the anti-predator aggression of nesting Lapwings results in a reduction of predation on nearby nests. We suggest therefore, that the breeding association of the two passerines and Lapwings is an anti-predator adaptation.
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