Horizontal, cloud-to-cloud lightning bolts, called anvil crawlers.
CARSTEN PETER/National Geographic Creative
Horse races are part of the commemoration of the victory over George A. Custer.
Manderson, South Dakota.
AARON HUEY/National Geographic Creative
A whale shark with small fry off the Yucatan Peninsula.
Isla Holbox, Yucatan Peninsula, Mexico.
BRIAN J. SKERRY/National Geographic Creative
A loggerhead turtle grazes on sea grass.
Gladden Spit, Belize.
A school of black margates off the reef at Hol Chan Marine Reserve.
Hol Chan Marine Reserve, Belize.
Whale sharks gather off the northern tip of the Yucatan Peninsula.
Yucatan Peninsula, Mexico.
A remora inside the mouth of a whale shark off the Yucatan Peninsula.
Mountaineers on 26,360-foot Gasherbrum II at sunset.
Gasherbrum II, Karakoram Range, Pakistan.
CORY RICHARDS/National Geographic Creative
A couple hand-raise orphaned koalas.
Ormiston, Queensland, Australia.
JOEL SARTORE/National Geographic Creative
A three-year-old female koala is trapped in a tree.
Petrie, Queensland, Australia.
Joeys cling to each other before being placed with human caregivers.
Beerwah, Queensland, Australia.
JOEL SARTORE, NATIONAL GEOGRAPHIC PHOTO ARK/National Geographic Creative
A koala recuperates in a hospital after being struck by a car.
Beerwah, Queensland, Ausralia.
Granite peaks of the Hajhir Mountains rise to nearly 5,000 feet.
Socotra Island, Yemen.
MICHAEL MELFORD/National Geographic Creative
The dragon blood tree uses its branches to grab moisture from mist.
The Diksam Plateau, where dragon's blood trees grow in scattered groves.
The spiritual leader and tribal chief of the Winnemem-Wintu tribe sends smoke prayers up to Mount Shasta.
LYNN JOHNSON/National Geographic Creative
A father caresses his newborn daughter.
Republic of Tuva, Russia.
A nichleu-nuggo, or village king, with his four wives.
Arunachal Pradesh State, India.
A Seri herbalist carries home lavender, mistletoe and senna from the desert.
Punta Chueca, Sonora State, Mexico.
A woman uses a scarf for shade as she visits her father's grave.
El Desemboque, Sonora State, Mexico.
A father sniffs his son, a Tuvan sign of affection akin to a kiss.
Tourists diving on Easter Island's reef encounter a fake moai.
RANDY OLSON/National Geographic Creative
Restored moai stand watch at Ahu Tongariki.
Ahu Tongariki, Easter Island.
Tourists photograph a native dancer in body paint.
An ancient Moai statue on a hillside at night.
Biologists explore a partially collapsed ice tower on Mount Erebus.
Ross Island, Antarctica.
The lava lake of Mount Erebus with ice and snow in the foreground.
Sunlight filters through a vent encrusted with frost crystals.
A team member investigates the passages of Hut Cave.
A microbiologist underneath the blue dome of an ice cave.
Participants emerge from a steaming inipi, or purification lodge.
Porcupine, Pine Ridge Indian Reservation, South Dakota.
Teenagers disregard the threat of a summer storm in the town of Wounded Knee.
Wounded Knee, Pine Ridge Indian Reservation, South Dakota.
Riders take a break during a day of activities to mark the 1876 defeat of Lt. Col. George Armstrong Custer.
Pine Ridge Indian Reservation, South Dakota.
A young man rides in celebration of the 1876 defeat of Lt. Col. George Armstrong Custer.
A storm chaser pursues a storm.
A ground fire ignited by a lightning storm.
Elephant Butte, New Mexico.
A 94 years old sits in the back of the pickup leading the annual Oglala Nation Powwow parade.
Pine Ridge Indian Reservation, South Dakota.
A submersible descends into a volcanic vent off Las Gemelas seamount.
Cabbage coral attached to the slope of a seamount near Raja Ampat.
Raja Ampat, Indonesia.
A sheephead and wrasses swim through a forest of coralline algae.
A harbor seal peers from a kelp forest on Cortes Bank.
A submersible descends into a volcanic vent off Las Gemelas Seamount.
Participants in the 14th annual Crazy Horse Ride.
Climbers and scientists follow a trail above the Kali Gandaki River.
A scientist scales a fragile rock face to reach 800-year-old caves.
A scientist hoists himself up at a Mustang cave entrance.
Dusk falls over the temples and homes of Tsarang.
Tsarang, Mustang, Nepal.
A Tibetan Buddhist lama leads his horse through the village of Samdzong.
Samdzong, Mustang, Nepal.
A manatee mother with her calf in tow grazes on turtle grass.
Swallow Cay, Belize.
A diver inspects the arched roots of mangroves.
A participant in the 14th annual Crazy Horse Ride.
A cheetah mother with cub in Serengeti National Park.
Serengeti National Park, Tanzania.
Frans Lanting/National Geographic Creative
A stalking cheetah juvenile surrounded by tourist vehicles.
Masai Mara National Reserve, Kenya.
A male cheetah assumes a lookout pose in a fig tree.
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