...The lower mandible, as thin as a paper-knife, is put into the water while the bird skims along the surface, and scoops up any little insects it meets... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...The deep portion arises from the portion of the alveolarborder of the superior maxillary bone which correspondsto the molar teeth, and from the anterior border of theramus of the mandible...
Édouard Cuyer 「Artistic Anatomy of Animals」
...The Razor-billed Auk is in form similar to the Murres, but the bill is verydifferent, being deep and thin, and with the upper mandible rounded at thetip...
Chester A. Reed 「The Bird Book」
...Young Skimmers are said to have both mandiblesof the same length, the abnormal development not appearing until after flight...
Chester A. Reed 「The Bird Book」
...Black; throat yellow; pectoral bar and under tail covers red; bill green, tip red; upper mandible carinated and yellow above, the sides with an orange spot; lower mandible varied with blue...
William Swainson 「Zoological Illustrations, Volume I」
...Adult, brick-red, the upper billblack terminally, and the mandible black along thecutting edge...
George Murray Levick 「Antarctic Penguins」
...He describes the iris as “light rufous; upper mandible dark slate,under mandible, legs, and feet pale slate...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Toes usually four, three front ones webbed; upper mandible curved and hooked; tailusually square (Gulls, subfamily Larinæ)...
Frank M. Chapman 「Color Key to North American Birds」
...Lower mandible longer than upper; forehead, underparts,part of secondaries, and tail white; rest of plumageblack...
Frank M. Chapman 「Color Key to North American Birds」
...Sooty brown, lighter below; region aboutbase of bill whitish; upper mandible broad and roundedat its base...
Frank M. Chapman 「Color Key to North American Birds」
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