... His only possible course as yet was the defensive, and there is no defense like silence... 
Talbot Mundy 「King--of the Khyber Rifles」
...These form its defensive armour, for,although the manis possesses powerful claws, it never uses themfor offence, but when attacked rolls itself into a ball...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Ink-sac, a defensive structure found in the squid...
Worrallo Whitney 「A Guide for the Study of Animals」
...Cottonmouths often squirt musk as a defensive action...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...It is curious to see exactly the same defensive methods employed by two builders of such different talents, one of whom handles flock, the other gum...
J. Henri Fabre 「Bramble-bees and Others」
...Upon this lid she builds her mass of cells in so many storeys, after which she covers the whole with a thick defensive plug...
J. Henri Fabre 「Bramble-bees and Others」
...The defensive fortification was the finishing-touch to the original structure...
J. Henri Fabre 「Bramble-bees and Others」
...Moreover, the defensive inlaying is slight; we see that the insect attaches no great importance to it and has every confidence in the stout wall of the home...
J. Henri Fabre 「Bramble-bees and Others」
... If your capture be an Halictus, there will be here a smooth and shiny line, a narrow groove along which the sting slides up and down when the insect is on the defensive...
J. Henri Fabre 「Bramble-bees and Others」
...One that was put on the defensive wouldusually maintain its stance for less than a minute if not further disturbedby movements of the trapper...
Henry S. Fitch 「Ecology of the Opossum on a Natural Area in Northeastern Kansas」
...Apparently this lighting up is a defensive measure, for the birds have nothing to do at night except to sleep, and must be rather incommoded than cheered by this light...
Frédéric Houssay 「The Industries of Animals」
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