Migration strategies

[rudy benavides]

Ron Gatrelle wrote....   "Don't strain you eyes in Belieze to look for trees
of cardui".
 
 
The following link was sent to me off-line
http://www.public.iastate.edu/~mariposa/elnino.htm and raises the following
questions still unclear to me, but which maybe someone can shed some light
on.  How far south do they migrate in the sporadic years mentioned? And, are
there some trans-migratory movements between Canada/US/Mexico?
 
Rudy Benavides
 
Baltimore County/MD
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