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In what I think is the most impressive behavior we've
yet seen in the odonate world, Rita and I watched a female Pacific
Spiketail ovipositing in a quiet, shallow corner of crystal-clear
Gumboot Creek at about 6000' elevation. She hovered over a single spot,
and constantly and repeatedly propelled herself up and down in a
vertical sewing-machine-like action as she drove her impressive
ovipositor into the silt at the bottom of the little pool. She seemed
oblivious to us. I was able to move from one angle to another as I
snapped shots. According to the time meter on the digital camera, I
started shooting at 10:46 a.m. and continued through 91 photos, ending
at 10:52 a.m., six minutes later. I then stepped aside as Rita returned
with her video, but the performance concluded just as Rita set up a
couple minutes later. At a minimum, she was at the task for 8 minutes,
thrusting downward at least once a second. Give or take a few seconds
during brief hovering rests, she must have completed 450 cycles, and
possibly 500 cycles. It is rare enough to see a Spiketail well — but
this went beyond all previous experiences. |
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