House Wrens have been known to destroy bluebird and other cavity-nester's eggs by piercing them, and then often removing them from the nest. They can remove an entire chickadee nest in a matter of hours. Althea Sherman reported that House Wrens destroyed eggs of 29 different birds. This wren was caught in the act on an infrared nestbox camera. For more information about House Wrens, see http://www.sialis.org.
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