Vanessa at night - migrations

Chuck Vaughn aa6g at aa6g.org
Mon Feb 4 09:01:42 EST 2002


 
>> For example, do they accept the ability of V. cardui to
>> cross large stretches of open water i.e. distances that
>> require at least part of the migration to be undertaken
>> at night?
> 
> Yes, there are those of us who are unconvinced Vanessa
> butterflies are functionally capable of migration one hour
> or more after sunset or one hour or more before sunrise.

It seems to me the way to answer this question is for someone
to get a pair of night vision googles and use them during a
V. cardui migration. Certainly you'll be able to see a few
of them flying by on a clear night, especially in the mid
spring to early summer when the summer Milky Way is high in
the sky and providing maximum light.

Here's just one of many places that sell them:

http://www.night-vision-goggles.com/

I'll bet you can get them on Ebay too.

Chuck <aa6g at aa6g.org>


 
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