Northern Prairie Wildlife Research Center
| Wing Character | Male | Female | ||
| Adult | Immature | Immature | Adult | |
| Tertials | Three or four most distal mostly white with wide black margins on outer webs; two more proximal are black; all have bluntly pointed tips | Outer web of most distal is white with a wide black margin; others are dark gray with dark marginal stripes on one or more; tips are pointed and usually frayed | More distal are gray- white with wide dark marginal stripes | |
| Greater tertial coverts | Most are white with smoothly rounded tips | All are dark gray-black and taper to tips which are usually frayed | All are shiny black with smoothly rounded tips | |
| Greater secondary coverts | Do not completely cover dark bases of secondaries on normally spread wing | |||
| Proximal 2/3 is white to tips | Proximal 2/3 is white or gray at tips | Proximal 2/3 is white with a black band (sometimes poorly defined) at tips | ||
| Middle and lesser secondary coverts | Do not completely cover dark bases of greater coverts on normally spread wing | |||
| Entirely white | Dark gray with females slightly darker than males | Very dark gray to black | ||
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/duckplum/redbmerg.htm
Page Contact Information: Webmaster
Page Last Modified: Friday, 01-Feb-2013 19:15:58 EST
Menlo Park, CA [caww54]
