Monarch butterfly migration to Mexico jumps after years of decline
by Associated Press in Mexico City from on (#1594K)
The insects covered over three and a half times more wintering grounds than last season, as diminishing milkweed and illegal logging has disrupted movement
Monarch butterflies have made a big comeback in their wintering grounds in Mexico after suffering serious declines, investigators said Friday.
The area covered by the orange-and-black insects in the mountains west of Mexico City this season was more than three and a half times greater than last winter. The butterflies clump so densely in the pine and fir forests they are counted by the area they cover rather than by individuals.
