Jump on the duck

Go to 2:58 in this video, and then...

-- Jump on the duck. -- They're turtles, not ducks! -- But this is Super Mario's Duck Hunt, isn't it? -- No, those are two different games in one Game Pak. They're Koopas, and Koopas are turtles. -- They're ducks. -- Ducks don't have shells. -- They're shell-ducks. I think I saw some in that Avatar cartoon, and here are some more. Didn't Mary, surrogate mother of Jesus, sacrifice two turtle ducks? -- No, those were turtle doves, at least in my copy of Luke 2:24.