Rolf Nussbaumer / Lucifer Hummingbird (Calothorax lucifer) female perched on Green Sotol (Dasylirion liophyllum) Chisos Basin, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, West Texas, USA

Rolf Nussbaumer / Male Lucifer Hummingbird (Calothorax lucifer) Big Bend National Park, Texas, USA. April 2001

Konrad Wothe / Lucifer Hummingbird (Calothorax lucifer) female incubating eggs on nest in Ocotillo Cactus, Arizona

Konrad Wothe / Lucifer Hummingbird (Calothorax lucifer) female incubating eggs on nest in Ocotillo Cactus, Arizona

Konrad Wothe / Lucifer Hummingbird (Calothorax lucifer) female incubating eggs on nest in Ocotillo Cactus, Arizona

Konrad Wothe / Lucifer Hummingbird (Calothorax lucifer) at feeder, Arizona

Kristel Richard / An Indian cowboy has lost his balance from a bronc or wild paint horse during the All Indian Rodeo, at the annual Indian Crow Fair, at Crow Agency, near Billings, Montana, USA, August 2011, Sequence 3...

Solvin Zankl / These hatchlings of an Olive ridley sea turtle (Lepidochelys olivacea) should be buried and protected under 40 cm of warm sand, but a domestic dog dug them out at Ostional beach in Costa Rica. Novembe...

Wild Wonders of Europe / della Ferrera / Herd of sheep with an old lady sheperd in a meadow of flowering Sticky catchfly (Silene viscaria) near the village of Gubin, Livanjsko Polje, Bosnia and Herzegovina, May 2009

Mark Taylor / Two Maine Coon kittens looking at an image of a mouse on a laptop computer.

Pete Oxford / Two Chagra cowboys on an overnight ride at a hacienda to herd cattle, Andes Mountains, Ecuador

Mark Hamblin / 2020VISION / Woman walking a dog on an upland plateau with Reindeer (Rangifer tarandus) in the background, Cairngorms National Park, Scotland, UK, August 2010.

Sue Flood / Silkworm moth (Bombyx mori) cocoons for production of silk thread, in Hoi An, Vietnam.

Bryan and Cherry Alexander / At a Selkup hunter's winter camp in the forest, a Laika dog has an 'igloo' for shelter, Ratta, Krasnoselkup, Yamal, Western Siberia, Russia 2012

LYNN M. STONE / Female Pug in an basket with Indian corn. USA

LYNN M. STONE / Female Pug dog in an basket with chrysanthemums, USA.

LYNN M. STONE / African Geese (Anser anser), in corn stubble; an old domestic breed whose name is misleading because the breed's wild progenitor was the Swan Goose of Southeast Asia. Calamus, Iowa, USA, October.

LYNN M. STONE / Gray Toulouse domestic Geese (Anser anser), an old domestic breed deveoped in France, whose wild progenitor was the Western Greylag Goose. Calamus, Iowa, USA, October.