what am I

This morning the girls were pretending to be different animals and we had to guess what they were.
They would give us hints to help us.
Haeli: I swim in the water
me: a fish, an alligator
Haeli: and I ate Joseph Smith!
me: um I don't think anything ate Joseph Smith
Maili: No, she means a prophet....she's a whale!
me: ohhhhhhhh