Whomping Willow
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The Whomping Willow is a very large, profoundly magical and fiercely violent tree in the fictional world of Harry Potter. One tree is known to reside on Hogwarts grounds; it's not known whether this is a unique specimen or a member of a species.
The Hogwarts tree is rooted to the spot, but will lash out at anyone who comes too close. Planted very young and now likely in its twenties, it's grown to a good height and become quite dangerous. On its early days, students often deliberately came under attack and tried to duck the blows, but this was eventually discontinued as it became too risky.
The tree has served as more than an example in aggressive botanics, however. It was planted to enable werewolf Remus Lupin to attend the school. The Willow covers one of the few remaining secret passages into and out of Hogwarts, this one leading into the abandoned and boarded Shrieking Shack in Hogsmeade. Lycanthropy not being a popular trait, Lupin would use this tunnel to spend every full moon in the Shack. As a side-effect, the Shack gained a reputation as the most haunted place in Britain (a transforming werewolf is in pain, and a werewolf in pain is loud).
The tree can be temporarily disabled by pressing a knot in its trunk, enabling safe passage. Only a few people know of its purpose and use; unfortunately, this includes the right hand of Lord Voldemort. Harry Potter and his friends first encountered the Whomping Willow at the start of their second year, as Harry and Ron crashed a flying car into it. The was damaged and promptly attempted to return the favor. They found out the details of the Willow's nature at the end of their third year.