Dong Lei / Speckled Wood Pigeon (Columba hodgsonii) Yadong County, Qinghai-Tibet Plateau, Tibet, China, Asia

Luiz Claudio Marigo / Picazuro pigeon (Patagioenas picazuro) perched in tree in Atlantic rainforest of Serrinha do Alambari Environmental Protection Area, municipality of Resende, Rio de Janeiro State, Southeastern Brazil.

Luiz Claudio Marigo / Picazuro pigeon (Patagioenas picazuro) perched in tree in Atlantic rainforest of Serrinha do Alambari Environmental Protection Area, municipality of Resende, Rio de Janeiro State, Southeastern Brazil.

Joel Sartore / Photo Ark / Thick-billed ground pigeon (Trugon terrestris) portrait, Walsrode Bird Park, Germany. Captive, occurs in New Guinea.

Roland Seitre / Thick-billed ground pigeon (Trugon terrestris) perched on branch, New Guinea. Captive.

Roland Seitre / Thick-billed ground pigeon (Trugon terrestris) portrait, New Guinea. Captive.

Roland Seitre / Thick-billed ground pigeon (Trugon terrestris) perched on branch, New Guinea. Captive.

Vishal Jadhav / Spotted dove (Spilopelia chinensis) walking on forest floor to drink water from a jungle stream, Maharashtra, India, March.

Vishal Jadhav / Spotted dove (Spilopelia chinensis) drinking water from a jungle stream with bees flying around, Maharashtra, India, March.

Philippe Clement / Madagascan blue pigeon / Madagascar blue-pigeon (Alectroenas madagascariensis) perched in tree, native to northern and eastern Madagascar, Africa. Captive. Digital composite

Philippe Clement / Black-chinned fruit dove / black-throated fruit dove / Leclancher's dove (Ptilinopus leclancheri) perched in tree, native to Taiwan and Philippines. Captive. Digital composite

Philippe Clement / Madagascan blue pigeon (Alectroenas madagascariensis / Columba madagascariensis) endemic to Madagascar, Africa. Captive. Digital composite