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American pika (Ochotona princeps) calling.  Beartooth Mountains, Wyoming/Montana border.  Fall--with a little skiff of snow.  This photo was taken in alpine setting at around 11,000 feet (3350 meters) elevation.  Most Americans say PIE-ka, but the rest of the world says PEE-ka, and makes the case for PEE-ka because it is (obviously) onomatopoeic of the pika's call.  Pikas are vocal animals, and will use a sharp call or whistle to warn others of danger or to protect their territories from intrusion from other pikas.