For the El Segundo blue, the LAX Dunes has a short, dog-friendly path on the north side called the Waterview Trail. The dunes are fenced off, and the main butterfly area is farther south, but ...

The Palos Verdes blue butterfly is so small and so blue — the kind of deep sky-blue that makes people exclaim, “What a beautiful day!” — that it looks more like jewelry than a living creature.

In 2004, the first Western pygmy blue was spotted just on the Washington side of the Columbia River. However, they've never shown up in quite the numbers butterfly enthusiasts are seeing this fall.

The Fender's blue butterfly, once thought extinct, ... The refuge is located on the north side of State Route 22 about two miles northwest of the intersection of Highways 22 and 99W, ...

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.