... Itwas a grim, a terrible silence, shot through with yellow-green light offerocious eyes, punctuated with undulating tremors of sinuous tail... 
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
... As his eyes wandered back and forthacross the undulating, shrub sprinkled ground they fell upon the formof a creature close beside the thick jungle where it terminatedabruptly at the plain's edge...
Edgar Rice Burroughs 「The Son of Tarzan」
...) ToKarungamagao's; very fine undulating green country...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...Went through an undulating hillycountry clothed with upland trees for three hours, then breakfast in anopen glade, with bottom of rocks of brown hæmatite, and a hole withrain-water in it...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...Wecrossed a rivulet, and away over beautiful and undulating hills andvales, covered with many trees and jambros fruit...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...The smooth, undulating green-grass plains were now superseded by lava expanses grown with low bushes...
Stewart Edward White 「African Camp Fires」
...The country was undulating, with ranges oflow hills...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...Their tail is shortand their flight slow andsomewhat undulating likethat of some of the Woodpeckers...
Chester A. Reed 「The Bird Book」
..."Large flocks of Ovis Polii were observed on the undulating highplateau to the south of the Chadow-Kul, where grass vegetation isabundant...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...The ovaries, which are milk-white, follow the line of the tubes, as inthe Zygodactyla, and have very undulating folds when full of eggs...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...Their flight isnoisy and undulating, like that of a woodpecker...
Douglas Dewar 「Birds of the Indian Hills」
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