When I see an animal that looks like a duck, swims like a duck, and lays eggs like a duck…

…I see a duck-billed platypus. Cf. Garland v. Cargill (Sotomayor, J., dissenting) ("When I see a bird that walks like a duck, swims like a duck, and quacks like a duck, I call that bird a duck."). Alas, a platypus does not quack.