Whisker

Definition and stakes

Theodore Wood,  The Animal World, A Book of Natural History

“ When they are spread out on either side, they measure from tip to tip exactly the width of the body. Besides this, there is a very delicate sensitive nerve at the root of every whisker, which runs straight to the brain. So, you see, if the tip of a whisker is touched, the brain feels it directly; and if as the lion is creeping through the bushes his outspread whiskers brush against the branches, he knows at once that there is no room for him to pass without making a noise and alarming his victim. ”
Source: Gutenberg

Arabella Burton Buckley,  The winners in life's race (1883)

“ Not only are his ears so quick of hearing that the smallest rustle in the grass startles him at once, while his large round eyes have a special reflecting mirror at the back to catch the faint rays of evening light when he prowls abroad, but the whisker-like tufts on his face are so provided with nerves at their base that when he raises them they are the most delicate feelers to guide him in the dark. ”
Source: Gutenberg

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