Captive-raising monarchs in cages also puts the butterflies at risk. The OE parasite can reach very high levels in indoor ...

Citizen scientists are called on to help with tagging monarch butterflies and find out why their numbers are dropping.

Monarch butterflies (Danaus plexippus) appear to be declining not just in North America but also in Australasia. Could this ...

The eastern population of monarch butterflies overwinters primarily in the oyamel fir forests of the Sierra Madre Mountains in central Mexico, which provide a microclimate essential for their survival ...

Will protecting monarch butterflies under the Endangered Species Act improve their chance of surviving? Not necessarily, 2 entomologists caution.

The U.S. Fish and Wildlife Service is proposing federal protections for the monarch butterfly. Last month, the service ...

Monarch butterflies are in decline in New Zealand and Australia, and they need our help to track where they gather, said an ...

The monarch butterfly, long idolized for its epic migrations ... 8, are reporting disturbingly low numbers at California’s coastal overwintering sites, where the western population of monarchs ...

Monarch butterflies are among the most beloved insects in North America and are on the decline. Here's why protection could help — but also has consequences.

The monarch butterfly's ancestral home in North America is noted for an annual mass migration and spectacular overwintering of adults in fir forests in a few locations in Mexico, at densities of ...

Monarch butterflies are among the most ... monarchs appear to be able to bounce back each year despite fewer numbers of overwintering butterflies. This would explain why observers still see ...