
This week, the butterflies are out in full force. During a spring hike along the North Fork of the Yuba River, we encountered literally thousands of this species, the California Tortoiseshell, which is known for its mass migrations. Surely, they are thriving from our recent rains, and the success of their host plant, the California Lilac (actually a group of related species of Ceanothus), all of which are blossoming profusely at the moment and filling the mountain air with their scent. During our hike, we were also greeted by many other species of butterflies, who were enjoying the puddles and moist mud from recent rains, and included swallowtails and California Sisters.
For more information about butterflies, visit the excellent site listed below created by a University of California professor, Art Shapiro: