A What?

Courtney had just had a bath and was wrapped up in her fluffy pink hooded towel.  I cuddled her and sang her the song I've sung all my kids after their baths as little ones and then asked her sweetly:

"Courtney, are you my pretty girl?"
Courtney:  "No."
"You're not?...Well, what are you then?"
[long pause, then very matter of fact]
"Um...a cock-a-dile."