This year, 500 monarch butterflies began their annual migration wearing a tiny tracker that weighs less than a grain of rice.

Scientists used tiny new sensors to follow the insects on journeys that take thousands of miles to their winter colonies in ...

Mexico's Butterfly Biosphere Reserve. Butterfly Pavilion is the first Association of Zoos and Aquariums (AZA)-accredited, standalone, nonprofit invertebrate zoo in the world and a leader in ...

Forest monitoring found that only five hectares of the core zone were affected, mainly due to natural causes and marginally due to clandestine logging. Mexico City – Five hectares of the Monarch ...

Picture yourself in a forest surrounded by a sea of fluttering orange, black, and white wings. The air is filled with the gentle rustle of millions of monarch butterflies. This is the amazing sight ...

The 56,259 ha biosphere lies within rugged forested mountains about 100 km northwest of Mexico City. Every autumn, millions, perhaps a billion, butterflies from wide areas of North America return to ...

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MEXICO CITY -- The number of monarch butterflies that showed up at their winter resting grounds in central Mexico decreased by about 26% this year, and four times as many trees were lost to illegal ...

Oklahoma residents witness large monarch butterfly migrations; experts urge planting milkweed and reporting sightings to track populations.

MEXICO CITY (AP) — A Mexican environmentalist says studies show illegal loggers have clear-cut at least 24 acres (10 hectares) in the monarch butterflies' wintering grounds in central Mexico. Writer ...