Some birds, like this non-native Eurasian collared dove, are expanding their territories. The bird count helps monitor their presence and spread. Photo by Debbie Hurlbert

Download Original: 3600 × 2400 Bay Area Bird Challenge: The Great Backyard Bird Count Is This Weekend!

Eurasian collared dove on ground

EurasianCollaredDove1_Debbie_Hurlbert_FL_2012_high 14 February,2013Sharol Nelson-Embry