http://www.norcalblogs.com/birds/2010/01/flying-in-the-rain.html
Birds are waterproof. Their feathers, made of protein similar to our fingernails, have interlocking barbs to make them both flexible and water resistant. Feathers overlap one another like roofing tiles to make the bird both aerodynamic and water repellent. Birds also have an oil gland at the base of their tail which they use to put a waterproof coating on their feathers.
So birds do fairly well during a rainstorm, at least for a short time.
Can birds fly in the rain?
http://answers.yahoo.com/question/index?qid=20070420144714AAPFJk8
YES, birds certainly can fly in the rain. Their feathers are oily and repel water.
How do birds keep dry in the rain?
http://wiki.answers.com/Q/How_do_birds_keep_dry_in_the_rain
Birds keep dry in the rain becuase their feathers have a certine oil on them.Water just slides past the oil leaving the birds nice and dry
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