cow's-tail

A raw cow's-tail lay on the floor, and by its side two pieces of black velvet -- my black velvet -- rudely hacked into the semblance of masks.

Life's Handicap Rudyard Kipling 1900

Kajunju, in the same wild manner, at the head of 150 warriors, with the soldier's badge -- a piece of mbugu or plantain-leaf tied round their heads, and a leather sheath on their spear-heads, tufted with cow's-tail -- rushed in exultingly, having found, to their delight, that there was no one left to fight with, and that they had gained an easy victory.

The Discovery of the Source of the Nile John Hanning Speke 1845