Contrasting reactions of loggerhead shrikes to two types of chemically defended insect prey.
Feeding tests with loggerhead shrikes (Lanius ludovicianus) showed this bird to acceptUtetheisa ornatrix, a moth (Arctiidae) protected by pyrrolizidine alkaloids, but to avoidLytta polita, a beetle (Meloidae) containing cantharidin.
International Birdwatching Center, P.O. Box 774, 88000, Eilat, Israel.
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