Blue butterfly eggs are small and easy to miss, said Jacobs. In addition to the rubberweed, their food source, workers are sectioning areas off where the butterflies are known to lay their eggs to ...

Several small, silvery-winged butterflies flitted among the native spotted bee balm and butterfly milkweed growing under the ...

The U.S. Department of Fish and Wildlife announced that the Fender’s blue butterfly’s status will officially be changed from “endangered” to “threatened” on Feb. 13.

The Fender's blue butterfly, once thought extinct, celebrates a revival. It is only found in Oregon's Willamette Valley. Here's how to see it: ...

The Xerces blue butterfly vanished from San Francisco in the 1940s. Scientists just released dozens of butterflies from a related species to take its place.