Monarch butterfly numbers drop by 27 percent in Mexico

The number of monarch butterflies wintering in Mexico dropped by 27 percent this year, reversing last year's recovery from historically low numbers, according to a study by government and independent experts released Thursday.

Beyond milkweed: Monarchs face habitat, nectar threats

In the face of scientific dogma that faults the population decline of monarch butterflies on a lack of milkweed, herbicides and genetically modified crops, a new Cornell University study casts wider blame: sparse autumnal ...

World's wild tiger count rising for first time in a century

The world's count of wild tigers roaming forests from Russia to Vietnam has gone up for the first time in more than a century, with some 3,890 counted by conservation groups and national governments in the latest global census, ...

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