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In addition to the bird-banding records of Mrs. Allegra Collister, <br />• we are also considering information from results of Christmas bird counts <br />for the Longmont area (which includes the Martin Marietta property), as <br />published in American Birds; results of sightings on the property by <br />plant employees and local bird club groups; and assistance supplied from <br />personal contact of members and use of records of the Foothills Audubon <br />Club of Longmont. <br />Vultures <br />The turkey vulture has been observed in the area during the summer <br />months, but is rather an infrequent visitor. <br />Accipiters <br />Goshawks are infrequent visitors to the area during the winter and <br />early spring time. <br />Sharp-skinned hawks are very prominent in the area; probably nests <br />in immediate area. <br />Harriarc <br />Marsh hawks are common to the property but they primarily work <br />open fields. <br />• Buteos <br />Rough-legged hawks are common to the property during the winter season; <br />improbable nester in the area. <br />Red-tailed hawk is very common and seen often by observers. Several <br />instances of nesting with successful raising of young. <br />Swainson's hawk - several sightings but not very common to the area. <br />Eagles <br />Both the golden and the bald have occasionally been observed during <br />the winter months, but, mostly, they are passing through the area and <br />stay for very short periods of time. <br />Falrnnc <br />The sparrow hawk is the smallest of falcons and is very common to <br />the property; it can be seen sitting on poles or telephone wires besides <br />the plant roads or in the quarry areas. <br />Cuckoos <br />Yellow-billed cuckoo is an infrequent visitor to the property; it is <br />• found in the woods and brushy ravines during outbreaks of tent caterpillars. <br />Owls <br />Screech owls are infrequent in the heavy riparian cover. <br />