Why do they say an elephant never forgets?

Question

Why do they say an elephant never forgets?

Answer 1

I think that's because they have big brains (big body size) and alot of that brain is used for memory storage.

Answer 2

It's in the Jungle Book.

Answer 3

In the past potures were often hunting elephants. Then when a human would rescue them. After several years the elephants would still remember who saved them.

Answer 4

I used to know but I've forgotten.  I've got a memory like one of those metal things with holes in.