Lake Elizabeth, Fremont, Alameda County, California, USA May 21, 2009
I have a series of photos showing several minutes of this fly backing into a sappy crevice and then wiggling her rear as she came out. Then repeating. Probably laying eggs.
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Contributed by Alice Cavette on 21 May, 2009 - 4:51pm Last updated 21 May, 2009 - 6:27pm