Definition of field mark in English:

field mark


  • A visible mark or characteristic that can be used in identifying a bird or other animal in the field.

    • ‘The wing bars, eye-rings, tail spots, and rump patches of a bird are the field marks that distinguish it from every other bird.’
    • ‘The next step in identifying the critter is what you thought you should be concentrating on all the while - its field marks.’