The population wintering in central Mexico's forests occupied 4.42 acres, up from 2.22 acres during the previous winter.

A sweeping new study reveals that butterfly populations across the continental United States have plummeted by 22% over the ...

From 2003 to 2019, amateur butterfly enthusiast Harlan Radcliff spent his lunch breaks observing butterflies on the grounds of the Camp Dodge military installation in central Iowa.

The butterflies migrate back to California from Eastern Washington in September and October. Much of what is know about the migration of of monarch butterflies in the West comes from James ...

Butterfly populations across the United States are declining, a trend reflected in the Western monarch butterfly population ...

From 2003 to 2019, amateur butterfly ... of the eastern range, Debinski said, especially if the species of milkweed they depend on is undergoing different phenological shifts than common milkweed.

“Monarchs are the face of the wildlife extinction crisis where even once common species could now disappear ... at the Center for Biological Diversity. The eastern monarch population is made up the ...

“Monarchs were once incredibly common ... turned orange by the clustering butterflies. The annual count is conducted by Mexico’s National Commission of Natural Protected Areas and World Wildlife Fund ...

“(The species) reaches its highest abundance in or near mesic or moist woodlands, particularly ash-dominated swamps, where ash is common ... the butterfly reaches as far as the “eastern ...

The study was one of several that assessed the effects of climate change on three species of butterflies whose populations are declining.