the mystery of Vanessa unidirectional migration

[Paul Cherubini]

Liz Day wrote:

> "All directions" is what I would expect if the species is simply dispersing
> and has no intention of returning before winter.   Right? 

Even tagged monarchs released at the same location on the same day and
at the same time during the fall migration have ended up at overwintering
locations 1500 miles apart: 
http://www.saber.net/~monarch/NorthAmerica.jpg

Paul Cherubini, Placerville, Calif.

 
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