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It was a test of faith. Once the staff had transformed - he was instructed to pick up the snake by tail - risking getting bitten - however, when he did as instructed - the snake turned back into a staff.
Yes.
no it has an actual snake for a tail
I am not sure about the tail scales-but if the head of the snake is triangular it means that that particular snake hold venom in his cheeks.
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.
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.
It wouldn't be a rattle snake or snake without a tail. Would it??
Yes there is a snake with two heads without tail, however such snakes are rarest of the rare.
Only the rattlesnake has a built in rattle. However, some other harmless species, such as the gopher snake, will vibrate its tail if threatened. If the snake happens to be on dry leaves or grass, this can produce a sound that mimics a rattlesnake.
No kangaroo can pick up grass in its tail. No kangaroo, not even the tree kangaroo, has a tail that is as prehensile as that.