...You cut a stake, sharpen it at one end, cut it about 15 inches long, about 1 inch in diameter; leave a prong about three inches long and about three inches from top to stake down trap... 
A. R. (Arthur Robert) Harding 「Fox Trapping」
...I sharpen the other end for the purpose of driving it into the ground...
A. R. (Arthur Robert) Harding 「Wolf and Coyote Trapping」
...In detecting prey the tongue acts to sharpen the sense of "smell" by conveying particles to Jacobson's organs in the roof of the mouth...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...It is better to give him an occasional feed of the raw grain, fora change, and to sharpen his appetite...
Richard L. Allen 「Domestic Animals」
...Take a rod 1/4 inch thick, cut in lengths 8 inches long, turn one end when hot over the ring of trap chain, sharpen the other end...
A. R. (Arthur Robert) Harding 「Mink Trapping」
...Cut a forked stick, one prong one inch long, the other 6 or 8 inches long; sharpen it, run your bait on this, put the stick in the back of the hole which fastens your bait...
A. R. (Arthur Robert) Harding 「Mink Trapping」
...A man proceededto skin one, not doubting that life was extinct,and after proceeding a little way with the operation, heleft the hut to sharpen his knife...
Various 「Natural History in Anecdote」
..."I sharpen serpents' teeth from time to time," offered Bell amiably...
Various 「Astounding Stories of Super-Science, May, 1930」
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