The findings revealed that 33% of butterfly species have experienced significant population declines over the past two decades, with 107 out of the 342 species examined losing more than half of ...

Two-thirds of studied species declined by more than 10%, the study said. Butterfly populations have dropped by 22% across 554 recorded species in the United States, according to a new study in the ...

Over the past 20 years the U.S. butterfly population has declined 22%, a dramatic loss that has scientists concerned. "The easy number to think about is the total number of butterflies in your yard.