...It is a small, cup-shapedstructure, suspended hammock-wise between two slender uprightbranches, and to which it is securely attached by fine hairs and webs... 
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...—Uniform dull black; inner webs of the wing-feathers marginedwith dull white; bill plumbeous, feet dark brown: whole length 5·7 inches,wing 3·0, tail 5·6...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...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」
...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」
...Browner; tail grayish brown; whiteon inner webs, with numerous blackish bars...
Frank M. Chapman 「Color Key to North American Birds」
...,white on inner webs with numerous indistinct blackishbars...
Frank M. Chapman 「Color Key to North American Birds」
...Feathers at base of bill red; crown and neck-stripeblack; back brownish; wings with a yellow band;inner webs of tail-feathers tipped with white; belowwhite tinged with brownish...
Frank M. Chapman 「Color Key to North American Birds」
...The most strikingcharacter of the swimming bird is derived from the structure of thefeet, which are always palmate—that is, furnished with webs betweenthe toes...
Robert Jennings 「Sheep, Swine, and Poultry」
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