Evolutionary differentiation in morphology, vocalizations, and allozymes among nomadic sibling species in the North American red crossbill (Loxia curvirostra) complex
Author(s)
Bibliographic Information
Evolutionary differentiation in morphology, vocalizations, and allozymes among nomadic sibling species in the North American red crossbill (Loxia curvirostra) complex
（University of California publications in zoology, v. 127）
University of California Press, 1993
- pbk. : alk. paper
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Note
"A contribution from the Museum of Vertebrate Zoology of the University of California at Berkeley."
Includes bibliographical references and index
Description and Table of Contents
Description
The highly variable North American red crossbill complex has presented one of the most controversial problems in avian systematics. Although crossbills wander nomadically and breed all year, they have not become homogenized in bill and body size. This study suggests that this crossbill complex contains several distinctive sibling species that breed sympatrically and show ecological differences.
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