Translations:Adventist Youth Honors Answer Book/Nature/Birds - Advanced/31/en
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Wing tags
In some surveys, involving larger birds such as eagles, brightly-colored plastic tags are attached to birds' wing feathers. Each has a letter or letters, and the combination of color and letters uniquely identifies the bird. These can then be read in the field, through binoculars, meaning that there is no need to re-trap the birds. Because the tags are attached to feathers, they drop off when the bird moults. Imping is the practice of replacing a bird's normal feather with a brightly-colored false feather. A patagial tag is a permanent tag held onto the wing by a rivet punched through the patagium.
