A guide to 16 exotic passerines of the lower 48 states and southern Canada. Read More “Non-native songbirds in North America”
European Goldfinch. Photo by stefbennett/Shutterstock
Eurasian Tree Sparrow
Exceptional immigrant
140 years after its introduction in North America, pleasant, understated Eurasian Tree Sparrow continues to win fans and attract birders Read More “Exceptional immigrant”