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Crocodile by Camera Trap

A remotely operated camera trap captures the tail end of a crocodile slinking to its den in Zakouma National Park, Chad. Triggered by infrared sensors tripped by the movement of a passing animal, camera traps have evolved from the trip-wire photography George Shiras pioneered in the late 1880s to high-tech digital traps with greater storage and memory capacity.

Photograph by Michael Nichols