I read a story (courtesy of Rusty Scalf) about how California vineyards are encouraging Western Bluebirds. They are building
Western Bluebird Image via Wikipedia
nesting boxes to attract the Western Bluebirds. In return the eat insects offer a green pest control service for the grape growers. Interestingly the story appeared in a UK newspaper. Read a detailed story about Western Bluebird nesting habits and their use in the vineyards in the UK Guardian: Bird-friendly California vineyards may have fewer pests.
Related articles
- In a California Vineyard, Bluebirds Earn Their Keep (green.blogs.nytimes.com)
Natural History Wanderings 
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