Ключевые слова: 2018, active, agriculture, annual spring migration, bird, breeding, colorado, conservation, conserve, crane, dawn, dusk, feeding, festival, fields, food, grasses, grazing, high mountain valley, hoot, march, meadow, migrate, migration, monte vista, national wildlife refuge, nesting, refuge, san luis valley crane festival, sanctuary, sandhill crane, sangre de cristo mountains, sound, spring, sunrise, supply, tour, upland, valley, view, visitor, waterfowl, wet meadows, wetlands, wildlife, winter,