I've never seen them do fast tail-shaking. I have seen
them curl their tails up and slowly shake them in a
wavelike motion. I noticed this most often just before
lunging at a cricket or other prey item. It looked
similar to a cat waving it's tail back and forth. It
could be some sort of diversion for the prey to catch
its eye on just before the U. phantasticus devours it.
I have also seen it used as a defensive territorial
sign. The few times I had seen this, it was females
aggravated at other females. I've quite often seen the
exact behavior in leopard geckos (E. macularius). I
hope this info helps. As far as the shadowing effects,
I'm not quite sure what you mean. Could you send a
picture to me, please? I'm quite interested to see
what you mean.
-Robert Gundy
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