Mexico documents big rebound in monarch butterflies

2016-02-27 11:44
A kaleidoscope of Monarch butterflies cling to tree branches, in the Piedra Herrada sanctuary, near Valle de Bravo, Mexico. (Rebecca Blackwell, File, AP)

A kaleidoscope of Monarch butterflies cling to tree branches, in the Piedra Herrada sanctuary, near Valle de Bravo, Mexico. (Rebecca Blackwell, File, AP)

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Mexico City - Investigators say Monarch butterflies have made a big comeback in their wintering grounds in Mexico after suffering serious declines.

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.

The number making the 5 500km migration from the United States and Canada declined steadily in recent years before recovering in 2014. This winter was even better.

This December, the butterflies covered a total of about 4ha, compared to 1.13ha in 2014 and a record low of 0.67ha in 2013.

Read more on:    mexico  |  insects

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