During a three-day visit to Corpus Christi and Brownsville Dumps
in Texas in mid-February, I was able to study c. 130+ adult smithsonianus
Herring Gulls. Of these, about 15 - 20% showed a distinct
yellowish tone in the legs; usually in the form of a dull, pale
yellowish-straw tone to the forepart of the tarsus - but on at
least two birds this same color was apparent over the entire leg
(just the toe-webbing looked more fleshy). On the birds with yellowish
tarsi, the remaining parts (tibia, "knees", feet) were
a darker dull purply-pink compared to the uniform bright fleshy-pink
legs of the majority of birds. Here are two fairly typical examples:
1)