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Monarch butterfly numbers lowest since 1995

The World Wildlife Fund says Mexico, US and Canada signed a pact twenty years ago to protect the species.

Last updated: 30 Jan 2014 06:04
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One of the world's largest annual migrations is at risk of disappearing.

Millions of butterflies usually move from Northern America to Mexico each winter, but experts say their numbers are declining.

Mexico monitors their numbers by measuring the areas they cover in forests where they cluster together in their thousands.

In 1995 it was almost 180,000 square kilometres, but last month they were down to an area of less than 6,000 square kilometres.

Al Jazeera's Caroline Malone reports.

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Source:
Al Jazeera
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