There aren't enough to block out the sun, but social media posts out of the Lake Tahoe area show enough swarming butterflies to get just about anyone who encounters them to pull over and start taking ...

Millions of butterflies are dancing through the skies above the Lake Tahoe Basin, delighting locals and tourists alike. The species is called the California tortoiseshell (Nymphalis californica) and ...

THE male small tortoiseshell butterfly is fiercely defensive: throw a stick nearby and it leaps up like a Labrador retriever to attack it. The aptly named dingy skipper is the ugliest butterfly ...