Source: Greystone Books, with permission. Rick McIntyre, who has logged more than 100,000 sightings of Yellowstone's wolves, is a legend―or most people would say the legend―among wolf researchers.

Their official name was the Middle Fork pack. But to some biologists, advocates and those paying close attention to wolf recovery efforts, the Mexican gray wolves had another name: the Tripod pack.

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An endangered gray wolf from San Francisco Zoo & Gardens has been safely transferred to a conservation center in New Mexico for breeding. The Mexican gray wolf is the world's most endangered wolf ...