Nagini Snake Harry Potter. In an interview JK. IIRC the snake never left captivity before Harry freed it.
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Years 5-7 she is considerably larger. No the snake in the first book is not Nagini. Weasley However the vision sent Harry into a crisis believing that he had become a snake-like monster or possessed by Voldemort.
Yes Nagini as in the humongous snakeHorcrux from the Harry Potter books is actually a person.
This is a masculine word. As was mentioned earlier the snake from the first book was bred in captivity. They are different and cannot be the same snake. Rowling revealed that it was the murder of Bertha Jorkins that made Nagini a Horcrux.