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Cliff Swallows and Pest Management

10,000 Birds

Cliff Swallows migrate to North America from their wintering grounds in South America to nest in large colonies, sometimes numbering in the thousands. In addition to their homing tendency, breeding swallows are attracted to old nests. Because IT IS ILLEGAL TO INTERFERE WITH NESTING BIRDS!! Herein lies the problem.

San Diego 165
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The Marsh Wren Singing and Gathering Nesting Material

10,000 Birds

These vociferous little birds can usually be heard throughout the freshwater and saltwater marshes in North America. According to Birds of North America Online , there may be several reasons. Back in the 2010 breeding season, I was able to observe a male building a nest at this exact same time of year.