What's the Difference Between a Duck? *

Daddy: (pointing to a picture in a book) "What's this?"
AJ: "A rooster."
Daddy: "And what's this?"
AJ: "A duck."
Daddy: "And this?"
AJ: "A duck."
Daddy: "Well, actually that's a goose."
AJ: "It's like a duck."

A few minutes later...

Daddy: "What's this?"
AJ: "A duck."
Daddy: "No, that's a swan."
AJ: "No...that's a duck."


* One of it's wings are both the same.