Charles Livingston Bull & Hal George Evarts 
Yellow Horde [EPUB ebook] 

The wolfer lay in his cabin and listened to the first few night sounds of the foothills. The clear piping notes of migrating plover floated softly down to him, punctuated by the rasping cry of a nighthawk. A coyote raised his voice, a perfect tenor note that swept up to a wild soprano, then fell again in a whirl of howls which carried amazing shifts of inflection, tearing up and down the coyote scale. One after another added his voice to the chorus until it seemed that the swelling volume could be produced by no less than a full thousand musical prairie wolves scattered through the foothills for a score of miles.