After flying some 3,000 miles from the northern U.S. and Canada to a remote forest in Central Mexico for the winter, tens of millions of monarch butterflies are making their way back north. These are ...
After flying some 3,000 miles from the northern U.S. and Canada to a remote forest in Central Mexico for the winter, tens of millions of monarch butterflies are making their way back north. These are ...
MEXICO CITY (Reuters) - The population of monarch butterflies in the Mexican forests where they spend the winter fell to the second-lowest figure on record this season, offering a grim snapshot of the ...