This is Treebeard he is an Ent. Ent’s are living walking trees that protect the forest and to achieve that they later in the book attack isengarde and destroy the water dam and flood the hole aria.
The River Anduin-The Gates of Argonath. The Argonath, also known as The Gates of Argonath or The Pillars of Kings, is a monument comprising of two enormous statues carved in the likenesses of Isildur and Anárion, standing upon either side of the River Anduin at the northern approach to Nen Hithoel. It marked the northern border of Gondor, as nearby down south were previous outposts, the Amon Hen and the Amon Lhaw.
The Science of Health - "Research has demonstrated that an imbalance in brain chemicals can contribute to the development of some mental disorders. It’s suspected that this chemical imbalance impedes the ability of the brain to send messages in between