Monarch butterflies are poisonous to predators because of the chemicals in the milkweed they eat as caterpillars. In just the 9 to 14 days of the larval stage, a monarch caterpillar can grow to 2,700 ...

Explore the worrying decline of Monarch butterflies in Texas and the implications for pollination and food production. Learn why preserving these butterflies is vital for a sustainable ecosystem.

The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly three decades as pesticides, diminishing habitat and climate ...

The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly three decades as pesticides, diminishing habitat and climate ...

This winter, volunteers from the Xerces Society, a nonprofit environmental group, tallied just 9,119 western monarchs — a ...

Scientists are grappling with a stark population decline of the western monarch butterfly after the species’ numbers hit a near all-time low.

The number of monarch butterflies spending the winter in the western United States dropped dramatically this year even as federal officials move to extend protections for the beloved pollinator ...

MADISON, Wis. (AP) — The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly three decades as pesticides, diminishing habitat ...