In 1971 two campers recorded what a Navy linguist calls a nonhuman language in the Sierra Nevadas

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In 1971, Ron Morehead and Al Berry set up camp in the Sierra Nevada mountains to record evidence of Bigfoot. Morehead was a believer. Berry was a skeptic looking to debunk a hoax. On the tape, the two can be heard whispering to each other before distant howls begin. They call back. More sounds fo…