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Examples of the colour(s) of the speculum in a number of ducks are:
- Common teal and green-winged teal: Iridescent green edged with buff.
- Blue-winged teal: Iridescent green. The species' common name comes from the sky-blue wing coverts.
- Crested duck and bronze-winged duck: Iridescent purple-bronze, edged white.
- Pacific black duck: Iridescent green, edged light buff.
- Mallard: Iridescent purple-blue with white edges.
- American black duck: Iridescent violet bordered in black and may have a thin white trailing edge.
- Northern pintail: Iridescent green in male and brown in female, both are white on trailing edge.
- Gadwall: Both sexes have white inner secondaries.
- Yellow-billed duck: Iridescent green or blue, bordered white.
Bright wing speculums are also known from a number of other birds; among them are several parrots from the genus Amazona with red or orange speculums, though in this case the colors are pigmentary and non-iridescent.
|Wikimedia Commons has media related to Speculum feathers.|
- Dunn, Jon L. & Alderfer, Jonathan (2006). National Geographic Guide to the Birds of North America. National Geographic Society. ISBN 1-4262-0072-2.
- Bellrose, Frank C. & The Audubon Society (1983). The Audubon Society Master Guide to Birding. National Geographic Society. ISBN 1-4262-0072-2.
- Madge, Steve; Burn, Hilary (1988). Waterfowl: an Identification Guide to the Ducks, Geese, and Swans of the World. Boston: Houghton Mifflin. ISBN 0-395-46727-6.
- Zimmerman, Dale A.; Turner, Donald A.; Pearson, David J. (1999). Birds of Kenya and Northern Tanzania. Princeton University Press. ISBN 0-691-01022-6.
- Robert S. Ridgely & John A. Gwynne, Jr. (1989). Birds of Panama with Costa Rica, Nicaragua, and Honduras. Princeton University Press. ISBN 0-691-08529-3.
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