For monarch caterpillars, the world of horror movies is all too real. Killer parasitoids live and grow inside their bodies, then burst from their lifeless corpses. This gruesome relationship has been ...

CHICAGO — An expert has confirmed what backyard gardeners and amateur naturalists have been saying for weeks: There are fewer monarch butterflies in Illinois this summer. At the national Monarch Larva ...

The community organization Alas Mayas (Mayan Wings) has detected a new migratory route for the monarch butterfly that crosses ...

Besides milkweed, monarchs need access to lots of nectar plants to build up their body fat for the long trip south. The International Union for Conservation of Nature (IUCN) last week added the ...

Every Monday in August, Heidi Emmons is leading a group of citizen scientists into fields containing milkweed to count monarch caterpillars and eggs. The goal is to learn more about how monarch ...