Great Barrier Reef, Queensland, Australia (© AWL Images/Danita Delimont)

Gray wolf with begging pup, Montana (© Tim Fitzharris/Minden Pictures)

Santa Cruz River, Patagonia, Argentina (© Coolbiere Photograph/Getty Images)

Aerial view of Marley Beach, Bermuda (© Paul Zizka/plainpicture)

The long plumes of a three-flowered avens as it goes to seed (© Sunshine Haven Photo/Shutterstock)

Aerial view of Everglades National Park, Florida (© Tetra Images/Getty Images)

Cheetah cubs climbing acacia trees in the Ngorongoro Conservation Area, Tanzania (© Paul Souders/Getty Images)