Well, that's what they say. I guess it's true. But if you ever find yourself talking to a Spanish speaking Elephant, you're going to need at least one of the following words...
Peanuts are cacahuates. Well, that is, if you're in Mexico.
In Spain you would call them cacahuetes.
And if that isn't confusing enough, in Colombia and a few other places, a peanut is called a maní.
Apparently this is a surprise to some Spanish speakers as well. Check out this thread. You'll also find out what other countries use maní for peanut.