The Yellow-headed Blackbird is a striking member of the Icterid family that occurs in Arizona primarily during the breeding season. Males are unmistakable with their glossy black plumage contrasted by a brilliant yellow head and chest, while females are smaller, browner, and duller with less extensive yellow. This species nests in dense colonies within cattail or bulrush marshes, especially in wetlands of the San Pedro River Valley, the Sulphur Springs Valley, and around agricultural ponds in the southeast and central parts of the state. Large breeding groups often share marshes with Red-winged Blackbirds, though Yellow-headed Blackbirds are more aggressive and frequently dominate the best nesting sites.
After breeding, they form flocks and are commonly observed in agricultural fields, stock ponds, and feedlots during migration and winter. Their presence is tied to water availability, so colonies expand or contract depending on wetland conditions. Though considered a species of Least Concern, their reliance on wetland habitats makes them vulnerable to drainage, drought, and habitat loss.
