The number of monarch butterflies spending the winter in the western United States dropped dramatically this year even as ...

The number of monarch butterflies spending winter in the western U.S. dropped dramatically this year, despite moves to extend ...

The Western population of the monarch butterfly has declined to a near-record low with fewer than 10,000 found living in ...

The U.S. Fish and Wildlife Service is taking steps to list monarch butterflies as threatened species and designate seven ...

The natural phenomenon of the iconic monarch butterflies migrating south for the winter is a fascinating one - and it's one that's under threat.

The count estimated a winter population of 9,119 monarchs this year as climate change, habitat loss, pesticides and disease ...

Overwintering populations of monarch butterflies in California have reached a near all-time low since records began, conservationists announced on Thursday. The ...

We know small populations are especially vulnerable to environmental fluctuations, and we think that’s what happened this ...

The monarch butterfly was first petitioned to be listed ... the main food source for the monarch caterpillar, were contaminated by 64 pesticides. One of these pesticides, methoxyfenozide, was ...

“A significant deterioration in numbers was found, according to the survey respondents,” said Martin Visser on behalf of the Moths and Butterflies of NZ Trust (MBNZT). “We compared the results of this ...

Monarch butterflies have declined 80 percent or more in recent decades Each year, eastern monarchs embark on a migration spanning thousands of miles and multiple generations to overwintering ...