A California ground squirrel, also known as a gray digger squirrel, keeps watch near its burrow in a meadow at Whistler's Bend Park near Glide, Ore., on Friday, April 22, 2011. Did you know California ground squirrels are often preyed on by rattlesnakes, but some populations have developed varying levels of immunity to rattlesnake venom. I had no idea, but Wikipedia says so, so it must be true.
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