Share this on WhatsApp [Hermit Warbler song] That’s a bird called the Hermit Warbler. It breeds along the U.S. West Coast. “They have a cute little yellow head, and a gray body.” Brett Furnas, a biostatistician at the California Department of Fish and Wildlife. Typically, birds sing the same one song within one region, because … Continue reading Warbler Species Fires Up Song Diversity