Evolution photos

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Scientists photographing dinosaur trackways

Juvenile Acrocanthosaurus print with human foot for scale

Exposing dinosaur footprints in the Paluxy River

Photosynthetic tree bark

Bighorn sheep in Badlands

Prairie dog in Badlands

Tundra wildflower in Montana

Tundra lily in Montana

Alpine meadow columbine

Devil's Tower

Miocene leaf fossil, Idaho

Fossilized Miocene leaf, Idaho

Miocene leaf with fall color, Idaho

Echinocereus cactus, Black Mesa, Oklahoma

Hantavirus house, Oklahoma

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Scientists photographing dinosaur trackways

Mike O'Brien (center) uses a camera on a pole to take overhead photos of dinosaur trackways in the Paluxy River bed, Texas, assisted by Brian Miles and Glen Kuban, September 2011.