Basilisk.
There are two mythical creatures that are described as having a rooster's head and the tail of a snake. They are the basilisk and the cockatrice.
rooster tail
It is called the corkscrew because if it is frightened, it coils its tail tightly.
An hourglass stands for time passing; a snake eating it's own tail is called an oroboros and stands for infinity.
through an opening called the cloaca at the base of its tail.
If it's a chicken then it's called "the parson's nose".
Yes.
The snake is an animal that has no tail.
no it has an actual snake for a tail
No, there is no 'snake tail' in any HP book.
The shape of its tail is pretty flat because it helps the snake swim faster in the water.
somewhere by its tail.