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Earth Matters : Brood parasites are more innovative survivors than evildoers

By Joshua Rose

Maybe you looked into a bird’s nest and saw one egg that was a different size and color than the rest. Or you noticed a chick that was larger, louder, and more aggressive than the others. Maybe you saw a parent bird feeding a chick larger than itself, and different in color and shape. What you saw was a brood parasite, an animal that fools animals of other species into caring for its offspring, usually at the expense of the host species’ own young.