Actually, Pam, the salmon-orange spot is my color-mark, made of water-soluble Liquid Paper colored with artist's pigment. The mark is temporary, but it can last several months or it can be lost promptly if the crown feathers are molted out. A federal permit is required to mark birds in this manner. However unsightly it is to see these painted up birds, the technique has proven to be extremely valuable for my study.
For purposes of the winter study, the color spots give each bird an individual identity. Often, the hosts think they may have 2 or 3 birds and by marking, we can determine 6-8 individuals. If the bird moves to a different site, it will be more noticeable. I am permitted for 7 colors and can also make stripes rather than spots to give me more individual color-marks. This is useful for yards that host 20-30 individuals.
For those who may be puzzled by Joan's reference to the feathers by number, R stands for rectrix [plural is rectrices] the technical name for the tail feathers. Hummers have 5 pairs, numbered from the middle pair R1 [right and left] to the outermost pair R5 [right and left]. Shapes and measurements of the wing [primaries] and tail [rectrices] enable us to distinguish among different species that may be very similar in appearance.
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Nancy L Newfield
Casa Colibrí
Metairie, Louisiana USA
USDA Zone 9
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