Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Photo: A rock ptarmigan (Lagopus muta millaisi) at Lundi Farm in Verl, Germany.

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A rock ptarmigan (Lagopus muta millaisi) at Lundi Farm in Verl, Germany. Shown is a male as it transitions from being an all-white bird in the winter to an all brown bird in the warm months.

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