Numbered nasal discs for waterfowl

Journal of Wildlife Management
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Numbered nasal discs were successfully used in studies requiring large numbers of individually marked waterfowl. The procedure for constructing these discs is outlined. Blue-winged teal (Anas discors) with 5/8-inch discs, and canvasback (Aythya valisineria) and redhead (A. americana) with 3/4-inch discs can be individually identified up to 50 and 80 yards, respectively, with a gunstock-mounted, 20-power spotting scope. The particular value of these markers is their durability, the number of combinations possible, and the apparent absence of behavioral or mortality influence among such species as the blue-winged teal.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Numbered nasal discs for waterfowl
Series title Journal of Wildlife Management
Volume 28
Issue 4
Year Published 1964
Language English
Contributing office(s) Northern Prairie Wildlife Research Center
Description 5 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Wildlife Management
First page 688
Last page 692