...tyrannulus,from which the present bird may be distinguished by the absenceof the rufous edgings to the inner webs of the rectrices... 
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...In order that thisinformation may be available, the young ducks asthey are hatched can be marked by toe punchingthem on the webs of their feet in the same mannerthat baby chicks are toe punched...
Harry M. Lamon 「Ducks and Geese」
...Large birds, two feet or more in length, varying widely in appearanceand habits; in external structure agreeing only in having all fourtoes joined by webs...
Frank M. Chapman 「Color Key to North American Birds」
...No webs between toes...
Frank M. Chapman 「Color Key to North American Birds」
...Tail with little if any white tip;inner webs of all but middle feathers with black andwhite bars...
Frank M. Chapman 「Color Key to North American Birds」
...Inner webs of all but middletail-feathers rust brown...
Frank M. Chapman 「Color Key to North American Birds」
...Inner webs of tail-featherslike outer webs; tail-feathers margined with rusty;breast and belly as in ; crown brownish, backgrayish olive-green...
Frank M. Chapman 「Color Key to North American Birds」
...narina, for an immature female specimen ofthe latter shows only rounded spots on the outer webs not exceeding 5...
James Chapin 「Descriptions of Three New Birds from the Belgian Congo」
...amoenissima, and the black at the base of the inner webs of the outermost rectrix does not extend beyond the tip of the under tail coverts...
Emil K. Urban 「Birds from Coahuila, Mexico」
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