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On a hot August day, I
watched this very ambitious female orbweaver
capture a cicada perhaps 3 times her size. I
happened upon the drama only after she had made
the initial snare and I suppose she had already
delivered the paralyzing bite to her prey as
there was no struggle left in the unfortunate.
The cicada had been trapped in her web about 4
feet off the ground, and the spider was in the
process off transferring the prey to a lower,
less conspicuous position.
She did this by a series by a complicated series
of web modifications whereby the entangling
original orb spokes were all severed (while
still maintaining the structural integrity of
the support web), resulting in the prey "bundle"
hanging from a single thread attached to one
long line. The spider somehow kept moving the
attachment point down that one long line,
although I could not quite tell how she was
doing it.
It was an amazing feat of
engineering that simply reinforced my admiration
for these top predators, the spiders. Humans can
barely set up a crane without it falling over
and killing people, and here is an organism
single-handedly, so to speak, moving three or
four times her own weight the equivalent of
200 stories through thin air, in a matter of
about 5 minutes. |