...The pugnacious spirit is one of the necessities of life... 
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...Thebold, pugnacious Brush Wattle-Bird is not so well known, thoughits notes are even more remarkable...
John Albert Leach 「An Australian Bird Book」
...Hardy, pugnacious and adaptable, the Sparrow is anotable success in the bird world...
Frank M. Chapman 「What Bird is That?」
...They are exceedingly impudent, familiar, and pugnacious...
Robert Jennings 「Sheep, Swine, and Poultry」
...The pugnacious, strong-jawed slave-hunter is utterly lost two steps away from her party...
J. Henri Fabre Alexander Teixeira de Mattos 「The Mason-bees」
...At the smalllake where they were then encamped, there was the ever-present likelihoodof a conflict with the pugnacious natives of the Darling...
Ernest Favenc 「The Explorers of Australia and their Life-work」
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