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 ...

Monarch butterflies are beautiful backyard favorites—but they’re also toxic. Monarchs lay their eggs on milkweed plants, ...

Monarchs store some of the chemicals in their bodies, making them poisonous and unpalatable ... That cost may be worth it for monarch butterflies because the benefit of being noxious to predators ...

What prompted the fuss? By claiming that a gene for a Bacillus thuringiensis (Bt) toxic protein makes corn pollen poisonous to Monarch butterflies,1 Losey's team ignited another round in the volatile ...

There's much more to milkweed plants than you know. Discover fascinating milkweed facts about this butterfly garden staple.

In a turn of events, the eastern monarch butterfly population — which was put on the list of endangered species just a few years ago — nearly doubled this year, according to a March report ...

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 ...