Trail images - Joel Sartore

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Horses are ridden through King’s Canyon National Park.

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A horse and rider lead a string of pack animals in King’s Canyon National Park, California, USA.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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A business man walks along the sidewalk near a bridge.

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A man in a cowboy hat stands on a dirt road during a snow storm.

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A man in cowboy boots stands on a dirt road during a snow storm.

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A young woman wears a heart mask on Valentine’s Day.

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Jet contrail at sunset near Lincoln, Nebraska.

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A truck drives at sunset along a rural road in Nebraska.

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Headlights illuminate a dirt road in Nebraska.

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A dirt road stretches through the overgrowth in Nebraska.

A Stock Island tree snail (Orthalicus reses reses), a federally-threatened species.

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A Stock Island tree snail (Orthalicus reses reses), a federally-threatened species.

A federally threatened Stock Island tree snail (Orthalicus reses reses).

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A federally threatened Stock Island tree snail (Orthalicus reses reses).

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Tourists take advantage of the many photo opportunities on Santa Cruz Island,Galapagos National Park.

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A group of tourists venture along a walking trail on Rabida Island in Galapagos National Park. All guests must stay with a guide and on trails at all time to lessen the impact on the habitat within the park.

The federally endangered Iowa Pleistocene Snail (Discus macclintocki). This is a relict from the last ice age, some 400,000 years ago. It lives in cold air vents on 37 different hillsides in Iowa (and one in Illinois) and survives only in the cold air that blows past underground ice and out of the cracks in limestone cliffs.

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The federally endangered Iowa Pleistocene Snail (Discus macclintocki). This is a relict from the last ice age, some 400,000 years ago. It lives in cold air vents on 37 different hillsides in Iowa (and one in Illinois) and survives only in the cold air that blows past underground ice and out of the cracks in limestone cliffs.

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An ocelot (Leopardus pardalis) photographed with a camera trap in Laguna Atascosa National Wildlife Refuge in Texas.

A bobcat (Lynx rufus) traverses along the Mexican-Texas border. A border wall along the lower Rio Grande in Texas divides nations as well as habitats, hindering daily essential movements of animals in the area. Bobcats would normally cross the border to find mates or catch dinner. The wall also blocks the dailly rounds of ocelots, another member of the cat family. Photograph by Joel Sartore with Mitch Sternberg, Jennifer Lowry, and Naghma Malik, all U.S. Fish and Wildlife Service.

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A bobcat (Lynx rufus) traverses along the Mexican-Texas border. A border wall along the lower Rio Grande in Texas divides nations as well as habitats, hindering daily essential movements of animals in the area. Bobcats would normally cross the border to find mates or catch dinner. The wall also blocks the dailly rounds of ocelots, another member of the cat family. Photograph by Joel Sartore with Mitch Sternberg, Jennifer Lowry, and Naghma Malik, all U.S. Fish and Wildlife Service.

Picture of a mother mountain goat (Oreamnos americanus) and her baby walk along a rocky path in Glacier National Park, Montana.

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A mother mountain goat (Oreamnos americanus) and her baby walk along a rocky path in Glacier National Park, Montana.

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A young man and girl bird watching along the Steamboat Trace trail between Nebraska City and Peru, Nebraska.

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A young man and girl bird watching along the Steamboat Trace trail between Nebraska City and Peru, Nebraska.