The number of migrating monarch butterfly in Mexico dropped - 30 Nov 2010  
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Despite successful preservation efforts of the monarch butterfly in Mexico, the number migrating from the USA and Canada in winter 2009 dropped by a full 75% due to reduced vegetation from changing weather patterns.


http://news.yahoo.com/s/ap/20101126/ap_on_re_la_am_ca/lt_mexico_butterfly_threat
 
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