Snake
Commonly found basking in the sun on surfaces such as asphalt, rocks, and wooden fences, snakes should be left alone if encountered1.
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For information about what you should do if you find a snake in your yard, click here to go to the Q&A page.
References:
1) Link, Russell (1997). Living with wildlife: Snakes. Retrieved April 5, 2009, from Washington Department of Fish and Wildlife Web site: http://wdfw.wa.gov/wlm/living/snakes.htm
2) Image is ClipArt from Microsoft Word