Climate change, habitat loss and insecticides tend to work together to weaken butterfly populations, Edwards and Haddad said.

Recent studies indicate that the number of butterflies in the USA is decreasing at an alarming rate. Their population has ...

The number of butterflies in the continental United States has fallen by 22% over the past 20 years, with nearly one-third of ...

Recent studies indicate that the number of butterflies in the USA is decreasing at an alarming rate, with their population ...

The number of monarch butterflies wintering in the mountains west of Mexico City rebounded this year, doubling the area they ...

Butterflies have been declining the last 20 years,” said study co-author Nick Haddad, an entomologist at Michigan State ...

In math and computer science, researchers have long understood that some questions are fundamentally unanswerable. Now ...