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.

Bernard Castelein / Yellow-rumped cacique (Cacicus cela) calling, Madidi NP, Bolivia

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

Marie Read / Baltimore oriole (Icterus galbula) male perched in pear (Pyrus sp.) blossom, eastern redbud in background, New York, USA. May.

Bence Mate / Collared aracari (Pteroglossus torquatus) squabbling with Montezuma oropendola (Psarocolius montezuma) Costa Rica.

Bence Mate / Montezuma oropendola (Psarocolius montezuma) hanging upside down as part of a courtship display. Costa Rica.

Bence Mate / Montezuma oropendola (Psarocolius montezuma) two interacting, Costa Rica.

Bence Mate / Montezuma oropendolas (Psarocolius montezuma) perched either side of Brown-hooded parrot (Pyrilia haematotis) in rain, Laguna del Lagarto, Santa Rita, Costa Rica

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

Marie Read / Baltimore oriole (Icterus galbula) male singing in spring, perched on Pear blossom (Pyrus sp.) flowers, New York, USA May.