USFWS biologists estimate the number of monarchs in each roost (23294313799)
Summary
Goleta, Calif. (December 9, 2015) USFWS biologists look forward to supporting the Xerces Society in future monarch butterfly counts, to get a better understanding of their population on the Western coast, and to monitor known overwintering locations.
Photo by Ashley Spratt/USFWS.
Tags
Date
12/01/2013
Source
U.S. Fish and Wildlife Service
Copyright info
Public Domain