Jack Dykinga / Yellow-headed blackbirds (Xanthocephalus xanthocephalus) and Redwing blackbirds (Agelaius phoeniceus) roosting. Whitewater Draw Wildlife Area, Arizona, USA, December.

Jack Dykinga / Murmuration of Yellow-headed blackbirds (Xanthocephalus xanthocephalus) and Redwing blackbirds (Agelaius phoeniceus) at sunset, before roosting. Whitewater Draw Wildlife Area, Arizona, USA, December.

Marie Read / Red-winged Blackbird (Agelaius phoeniceus) male displaying in cattail marsh, Viera Wetlands, Brevard County, Florida, USA, January.

Alan Murphy/ BIA / Red-winged Blackbird (Agelaius phoeniceus) male, Texas

Gerrit Vyn / Red-winged blackbirds (Agelaius phoeniceus) in flight. Lower Klamath National Wildlife Refuge, Siskiyou County, California, USA. December.

Gabriel Rojo / Bay-winged cowbird,(Agelaioides badius) chicks begging for food, La Pampa, Argentina

Alan Murphy / Red-winged Blackbird (Agelaius phoeniceus) males fighting, Texas

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) male calling, Kensington Metropark, Michigan

Shattil & Rozinski / Large flock of Red winged blackbirds (Agelaius phoeniceus) flying across road, Lower Rio Grande Valley, Texas, USA

Rolf Nussbaumer / Red winged blackbird, male singing on yucca plant {Agelaius phoeniceus} Texas, USA

David Pike / Yellow winged blackbird, (Agelasticus thilius) perched on plant, Bicentennial Park, Santiago, Chile.

Jack Dykinga / Murmuration of Yellow-headed blackbirds (Xanthocephalus xanthocephalus) and Redwing blackbirds (Agelaius phoeniceus) before roosting. Whitewater Draw Wildlife Area, Arizona, USA, December.