The European Goldfinch (Carduelis carduelis) is a small passerine songbird in the finch family that is native to Europe, North Africa, and western Asia. This...
Identification
The lesser goldfinch (Spinus psaltria) is a very small songbird of the United States. The bird has a crown, nape, back, and upper tail...
Songbirds' singing is a complex behavior that must be learned. It has stimulated rapidly advancing research in various disciplines, notably neurobiology and behavioral ecology....