Angelo Gandolfi / Four Griffon vultures (Gyps fulvus) flying over Mallos de Aguero cliffs and village of Aguero, Aragon, Spain.

Angelo Gandolfi / Griffon Vultures (Gyps fulvus) flying above the Penafalcon cliffs, Monfrague National Park, Spain.

Angelo Gandolfi / Griffon vulture (Gyps fulvus) flying at sunset, Spain.

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Wild Wonders of Europe / Muñoz / Northern gannet (Morus bassanus) colony on Stac Lee, St. Kilda Archipielago, Outer Hebrides, Scotland, UK, June 2009

Wild Wonders of Europe / Green / Northern gannets (Morus bassanus) in flight over cliffs, St Kilda, Scotland, May 2009

Wild Wonders of Europe / Green / Northern gannet (Morus bassanus) colony on cliffs in mist, Hermaness, Shetland Isles, Scotland, July 2009

Wild Wonders of Europe / Green / Northern gannet (Morus bassanus) colony, St Kilda, Scotland, May 2009

Wild Wonders of Europe / Green / Northern gannet (Morus bassanus) in flight over cliffs, St Kilda, Scotland, May 2009

Andy Rouse / Barnacle goose (Branta leucopsis) flock flying in formation, Islay, Scotland

Angelo Gandolfi / Four Griffon vultures (Gyps fulvus) flying over Mallos de Aguero cliffs and village of Aguero, Aragon, Spain.

Angelo Gandolfi / Griffon Vultures (Gyps fulvus) flying above the Penafalcon cliffs, Monfrague National Park, Spain.

Angelo Gandolfi / Griffon vulture (Gyps fulvus) flying at sunset, Spain.

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Wild Wonders of Europe / Muñoz / Northern gannet (Morus bassanus) colony on Stac Lee, St. Kilda Archipielago, Outer Hebrides, Scotland, UK, June 2009

Wild Wonders of Europe / Green / Northern gannets (Morus bassanus) in flight over cliffs, St Kilda, Scotland, May 2009

Wild Wonders of Europe / Green / Northern gannet (Morus bassanus) colony on cliffs in mist, Hermaness, Shetland Isles, Scotland, July 2009

Wild Wonders of Europe / Green / Northern gannet (Morus bassanus) colony, St Kilda, Scotland, May 2009

Wild Wonders of Europe / Green / Northern gannet (Morus bassanus) in flight over cliffs, St Kilda, Scotland, May 2009

Andy Rouse / Barnacle goose (Branta leucopsis) flock flying in formation, Islay, Scotland

Konrad Wothe / Booted Racket-tail (Ocreatus underwoodii) feeding on flower nectar, Ecuador

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) male flying, feeding from flower, Mindo, Ecuador, Andes, South America, January

Staffan Widstrand / Wild Wonders of China / Greater racket-tailed drongo (Dicrurus paradiseus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Ingo Arndt / White-bellied woodstar (Chaetocercus mulsant) and Booted racket-tail (Ocreatus underwoodii) female. Hummingbirds necaring on flower. Western slope of Andes, Ecuador. October.

Ingo Arndt / Booted racket-tail hummingbird (Ocreatus underwoodii) male flying below flower. Western slope of Andes, Ecuador. October.

E.J. Peiker/ BIA / Booted Racket-tail (Ocreatus underwoodii) hummingbird feeding on flower nectar, Ecuador

Konrad Wothe / Booted Racket-tail (Ocreatus underwoodii) feeding on flower nectar, Ecuador

Konrad Wothe / Booted Racket-tail (Ocreatus underwoodii) feeding on flower nectar, Ecuador

Lucas Bustamante / Buff-tailed coronet (Boissonneaua flavescens) and female Rufous booted racket tail (Ocreatus underwoodii addae) fighting in flight, Mashpi, Pichincha, Ecuador.

Lucas Bustamante / Booted racket tail (Ocreatus underwoodii) two males fighting in flight, Mindo, Pichincha, Ecuador.

Mary McDonald / Rufous-booted racquet-tail (Ocreatus underwoodii peruanus) male hummingbird landing, Amazonian foothill forest, Ecuador. April.

Melvin Grey / Booted racket-tail (Ocreatus underwoodii melanantherus) adult male perched on moss-covered branch situated near feeder, Mindo Loma, Ecuador. February.

Glenn Bartley/ BIA / Booted Racket-tail (Ocreatus underwoodii) hummingbird feeding on flower nectar, Ecuador

Hanne & Jens Eriksen / Racket tailed treepie (Crypsirina temia) Thailand, February

Steve Gettle / Booted Racket-tail (Ocreatus underwoodii) hummingbird feeding on flower nectar, Tandayapa Valley, Ecuador

Murray Cooper / Booted Racket-tail (Ocreatus underwoodii) hummingbird, Ecuador

Murray Cooper / Booted Racket-tail (Ocreatus underwoodii) hummingbird, Ecuador

Nate Chappell/ BIA / Booted Racket-tail (Ocreatus underwoodii) males fighting, Pichincha, Ecuador

Melvin Grey / Booted racket-tail hummingbird (Ocreatus underwoodii melanantherus) hummingbird adult male flying to feed from flower,. Tandayapa, Ecuador

Tui De Roy / Booted Racket-tail (Ocreatus underwoodii) hummingbird, Bellavista Cloud Forest Reserve, Tandayapa Valley, Andes, Ecuador

David Tipling / Rufous-tailed Hummingbird (Amazilia tzacatl) and Booted racket-tails (Ocreatus underwoodii) around feeder, Ecuador.

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) hummingbird landing, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) hummingbird feeding on flower nectar, Ecuador

Guy Edwardes / Booted Racket-tail Hummingbird (Ocreatus underwoodii) perched, Belllavista, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) male, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) female, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) female, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) male visiting flower, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) male, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) male, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) male, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) male, Ecuador

Glenn Bartley / Booted Racket-tail (Ocreatus underwoodii) female, Ecuador

Tui De Roy / Booted racket tail (Ocreatus underwoodii) Bellavista cloud forest private reserve, 1700m altitude, Tandayapa Valley, Andean cloud forest, Tropical Andes, Ecuador

Tim Fitzharris / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on flower nectar, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) male feeding on flower nectar

Murray Cooper / Booted Racket-tail (Ocreatus underwoodii) hummingbird male, Andes, Ecuador

Michael & Patricia Fogden / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on nectar of Bomarea (Bomarea multiflora) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on nectar of Bomarea (Bomarea multiflora) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on nectar of Tiger Orchid (Elleanthus robustus) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Tim Fitzharris / Booted Racket-tail (Ocreatus underwoodii) hummingbird male hovering near orchid, Ecuador

Tim Fitzharris / Booted Racket-tail (Ocreatus underwoodii) hummingbird male hovering, Ecuador

Tim Fitzharris / Booted Racket-tail (Ocreatus underwoodii) hummingbird hovering, Costa Rica

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) and Purple-bibbed Whitetip (Urosticte benjamini), adults feeding from Ginger flower, Mindo, Ecuador, Andes, South America, February

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) female flying, feeding from flower, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) male flying, feeding from flower, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) flying / feeding and Purple-bibbed Whitetip (Urosticte benjamini) perched, Mindo, Ecuador, Andes, South America, February

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) male perched, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Booted Racket-tail (Ocreatus underwoodii), Green-Crowned Woodnymph (Thalurania fannyi) and Brown Inca (Coeligena wilsoni) adults feeding on Ginger flower, Mindo, Ecuador, Andes, South America, Februar...

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) two females feeding from flower, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii) female flying, feeding from flower, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Booted Racket-tail hummingbird (Ocreatus underwoodii), male flying / feeding from Ginger flower, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Booted Racket-tail (Ocreatus underwoodii) and Green-Crowned Woodnymph (Thalurania fannyi) adults feeding on flower, Mindo, Ecuador, Andes, South America, February

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird male hovering in front of flower, eastern slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird female hovering in front of flower, eastern slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird female hovering in front of flower, eastern slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird female hovering in front of flower, eastern slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird female hovering in front of flower, eastern slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird male, and Western Emerald (Chlorostilbon melanorhynchus) hummingbird feeding on flower, western slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird male hovering at flower, western slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding at flower, western slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird male hovering at flower, western slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding at flower, western slope of Andes, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) hummingbird male pair hovering at flower, western slope of Andes, Ecuador

Pete Oxford / Booted racket tail {Ocreatus underwoodii} Mindo cloud forest, Ecuador.

Pete Oxford / Booted Racket-tail (Ocreatus underwoodii) hummingbird, feeding at flower in cloud forest, west slope of the Andes, Ecuador

Pete Oxford / Booted Racket-tail (Ocreatus underwoodii) hummingbird, in cloud forest, Ecuador

Konrad Wothe / Booted Racket-tail (Ocreatus underwoodii) feeding on flower nectar, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) male feeding on flower nectar

Michael & Patricia Fogden / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on nectar of Bomarea (Bomarea multiflora) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Roland Seitre / Golden-mantled racket-tailed parrot (Prioniturus platurus) perched on branch, Philippines. Captive, occurs in Indonesia.

Roland Seitre / Blue-headed racket-tail (Prioniturus platenae) perched on branch, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tailed parrot (Prioniturus discurus whiteheadi) perched on branch, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tailed parrot (Prioniturus discurus whiteheadi) perched on branch, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tailed parrots (Prioniturus discurus whiteheadi) pair perched on branch, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tailed parrots (Prioniturus discurus whiteheadi) pair perched on branch, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tailed parrots (Prioniturus discurus whiteheadi) pair perched on branch, Philippines. Captive.

Joel Sartore / Photo Ark / Golden-mantled racket-tail parrot (Prioniturus platurus platurus), Anak Burung Tropikana, Bali, Indonesia. Captive.

Joel Sartore / Photo Ark / Golden-mantled racket-tail parrot (Prioniturus platurus platurus), Anak Burung Tropikana, Bali, Indonesia. Captive.

Joel Sartore / Photo Ark / Golden-mantled racket-tail parrot (Prioniturus platurus platurus) looking at tail feathers, Anak Burung Tropikana, Bali, Indonesia. Captive.

Joel Sartore / Photo Ark / Golden-mantled racket-tail parrot (Prioniturus platurus platurus), Anak Burung Tropikana, Bali, Indonesia. Captive.

Joel Sartore / Photo Ark / Blue-crowned racket-tailed parrot (Prioniturus discurus whiteheadi), Negros Forest Park, Bacolod, Philippines. Captive.

Joel Sartore / Photo Ark / Blue-crowned racket-tailed parrot (Prioniturus discurus whiteheadi), Negros Forest Park, Bacolod, Philippines. Captive.

Joel Sartore / Photo Ark / Blue-crowned racket-tail parrot (Prioniturus discurus discurus), Avilon Zoo, Rizal, Philippines. Captive.

Joel Sartore / Photo Ark / Blue-crowned racket-tail parrot (Prioniturus discurus discurus), Avilon Zoo, Rizal, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tail parrot (Prioniturus discurus whiteheadi) perched on branch, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tail parrots (Prioniturus discurus whiteheadi) pair, courtship display, Philippines. Captive.

Roland Seitre / Blue-crowned racket-tail parrots (Prioniturus discurus whiteheadi) pair, courtship display, Philippines. Captive.

Steve Gettle / Booted Racket-tail (Ocreatus underwoodii) hummingbird feeding on flower nectar, Ecuador

Steve Gettle / Booted Racket-tail (Ocreatus underwoodii) hummingbird feeding on flower nectar, Ecuador

Richard Flack / Racket-tailed roller (Coracias spatulatus) perched at entrance to nest hole in tree trunk, Makuleke Concession, northern Kruger National Park, South Africa.

Roland Seitre / Booted Racket-tail (Ocreatus underwoodii) hummingbird, Colombia

Karine Aigner / Booted racket-tail hummingbird (Ocreatus underwoodii melanantherus) hummingbird sitting on a branch. Mindo, Ecuador