Sentence:  "Hornless Stags" are not unknown, especially in the German forests. By this expression is meant, not stags wich have once carried antlers and shed them, but stags which have never possessed any. In the Highlands they are termed <WSD>"hummel</WSD>" stags; ... "Haviers", or stags which have been gelded when young, have no horns, as is well known, and in the early part of the stalking season, when seen through a glass, might be mistaken for <WSD>"hummels</WSD>"; but as the season advances, the necks of the latter swell, and (except in the matter of horns) they assume all the characteristics, both in appearance and behaviour, of ordinary stags, and are thus easily distinguished from "haviers". 
Meaning of the word marked with <WSD> tags:  A stag that has failed to grow antlers; a cow that has not developed horns. (from late 15th c.)