... mark that means anything. I've seen grizzlies bite hunks out o' trees an' scratch 'em just as a cat might, an' in the summer when they get itchy an' begin to lose their hair they stand up an' rub against trees. They rub because they itch an' not because they're leavin' their cards for other bears. Caribou an' moose an' deer do the same thing to get the velvet off ... — The Grizzly King • James Oliver Curwood
... without rigid birth controls, usually increased geometrically. Jason dinAlt suddenly remembered Meta's itchy trigger finger. ... — Deathworld • Harry Harrison
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