Why ask, "Why did the chicken cross the road?" when you can instead consider, "Why did the road cross the land?" ...

On the slopes of a volcano in central Mexico, biologist Cuauhtémoc Sáenz-Romero and his team envision a climate refuge for oyamel fir trees and the monarch butterflies that depend on them.

Monarch butterflies are migrating through the Permian Basin, embarking on a 2,000-mile journey to Mexico as part of their ...

With vigorous debate surrounding the health of the monarch butterfly population ... that monarchs are dying off during their fall migration south to Mexico. The UGA researchers found that ...

The planting of non-native milkweeds along the migration path has resulted in the rise of a parasite called Ophryocystis elektroscirrha (OE), which infects and debilitates monarch butterflies.

Many infected monarch caterpillars don’t make it to adulthood. Those that do can’t fly well and don’t live long, possibly contributing to the fallout of butterflies along the migration path.

Many infected monarch caterpillars don’t make it to adulthood. Those that do can’t fly well and don’t live long, possibly contributing to the fallout of butterflies along the migration path. Nonnative ...

The migration of the monarch butterfly is one of the wonders of the natural world. Each autumn, a new generation of monarch butterflies is born in the northern United States and southern Canada.

Monarch butterflies are among the planet ... In an effort to help this grueling migration, a team of scientists has planted new overwintering sites along the slopes of a Mexican volcano.