The sickle tail is the single phenotypic characteristic that seems to separate dogs from wolves. Dogs who have tails tend to have an upward curve in the tail, which is called the sickle tail. Wolves' tails, on the other hand, hang straight; this is called the brush tail—similar to that of a fox.
Famous quotes containing the word tail:
“What a wonderful bird the frog are—
When he stand he sit almost;
When he hop, he fly almost.
He ain’t got no sense hardly;
He ain’t got no tail hardly either.
When he sit, he sit on what he ain’t got almost.”
—Unknown. The Frog (l. 1–6)