Field mark

The "spectacles" of a black-capped vireo are considered a distinguishing field mark[1]
The sharp, "V-shaped" intersection of forehead and bill is a key distinguishing feature of the trumpeter swan, pictured, from its congener tundra swan (which sports a "U-shaped" intersection)[2]

A field mark is a characteristic (e.g. in plumage) useful for species identification, usually birds. They are often used in field guides or identification keys. Field marks generally refer to distinct diagnostic differences in plumage.[1][3] In a broader context, a field mark might be referred to as a character (e.g. "differential character" or "diagnostic character").[citation needed] For birds this may include plumage, but also flight characteristics, size, call, behaviour, or other characteristics which aid in identification.[4] As opposed to in-hand marks, distinguishable when a specimen is held in the hand, field marks are especially those marks that remain useful in less than optimal conditions, for example when the subject is far removed, only partly visible or not sufficiently lit to see its colours.

References

  1. ^ a b "Field Markings — Texas Parks & Wildlife Department". tpwd.texas.gov. Retrieved 20 June 2024.
  2. ^ Sibley, David (2006-02-19). "Distinguishing Trumpeter and Tundra Swans". Sibley Guides.
  3. ^ "Bird ID Skills: Field Marks". All About Birds. 2009-04-20. Retrieved 2026-03-10.
  4. ^ "How to Identify Birds | Audubon". www.audubon.org. Retrieved 2026-03-10.


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