...The general appearance, pugnacious behavior, and whitish mouth of water-snakes (Natrix) have earned them a bad reputation... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Thebold, pugnacious Brush Wattle-Bird is not so well known, thoughits notes are even more remarkable...
John Albert Leach 「An Australian Bird Book」
...One day the bird came to the gate as usual, and was more alert and pugnacious than ever; and no wonder, for his mate came too, and with them four young birds...
W. H. Hudson 「Birds in Town and Village」
...Gilbert Whitesays: "The Missel-thrush is, while breeding, fierce and pugnacious,driving such birds as approach its nest with great furyto a distance...
Various 「Natural History in Anecdote」
...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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