David Locklear said:

>I am almost certain that the migration path includes a pitstop for a day or 2 
>at Grutas de Carrizal in Nuevo Leon just east of the town of Candela.

>Maybe a caver could document that or some other karst area where they stop 
>along the way to rest.

      I have camped at Bustamante Canyon when the monarchs were migrating.  
They covered every bush and tree along the stream at night.  In the morning the 
air was filled with butterflies.  We drove very slowly to give them time to 
move out of the way.  It was very cool.

Mark Minton

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