Exceptional, divergent, having marked difference or differences from others of its kind  .
- ^ Terres, John K. (1980). The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf, Inc. ISBN 0394466519.
- ^ Van Tyne and Berger, A.J. 1959. Fundamentals of ornithology. New York. John Whitley & Sons, Inc.
|| This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.
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