MONARCHS IN WINTER Declines in the numbers of monarch butterflies crowding into winter refuges in Mexico (shown) raise the question of what’s going on the rest of the year.
Pablo Leautaud/Flickr (CC BY-NC 2.0)
MONARCHS IN WINTER Declines in the numbers of monarch butterflies crowding into winter refuges in Mexico (shown) raise the question of what’s going on the rest of the year.
Pablo Leautaud/Flickr (CC BY-NC 2.0)