http://www.mdc.mo.gov/nathis/birds/emobirds/
Wrens are among the smallest songbirds, yet they make their presence known in a big way. They are both loud and persistent singers. Birds use song, in part, to announce their breeding territories. House wrens aggressively defend their territories, often driving away much larger birds, and even mammals! Wrens are energetic brown birds, smaller than sparrows, with slender, slightly curved beaks. Wrens pose with their tails cocked in an upright position. This distinctive posture makes wrens easy to identify. The most common backyard wren is the house wren. You can attract wrens to backyard birdhouses, but they sometimes seem to prefer unusual places to build nests. Wrens have been found nesting in old coffee cans, baskets, hats, shoes, and even in the pocket of a pair of overalls hanging on a line.
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