Traffic in plants and plant seeds

[Semjase]

>> Today over 90% of the 40 largest overwintering sites for the monarch
>> butterfly (a butterfly native to North America) along the California
>> coast occur in ornamental/agricultural plantings of exotic eucalyptus
>> trees. 
>
>What did the monarchs use before?
>
>Liz Day   

Thats a good question, maybe they didn't use anything but went someplace else! 
 History Buffs?

S
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