Not Alarmed but why?

[Kenelm W Philip]

> Many times, when I spy the lep, I stop moving my head,
> and the lep takes off!  Clearly it knows it has been spotted.

It is possible that all the butterfly is doing is reacting to the
second derivative of the motion of your head--that is, to the
rate of change of the speed with which your head moves. Try
stopping the movement of your head gradually rather
than suddenly, and see if that helps.

		Ken Philip



 
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