Where I live now I sometimes hear woodpeckers but have never actually seen one to photograph.
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On a trip to Griffith Park in Los Angeles, however, I did spot one at a sprinkler head looking for a drink of water.
Woodpecker drinking: Taken 17 Nov 2011 with a Nikon D90 and AF-S Nikkor 18-105 zoom at 105mm using ISO-400 at f5.6 and 1/160sec.