So, do ducks have teeth? I was looking up images of ducks' bills when all of a sudden, I noticed that on its bill, it had these sharp, scary-looking "teeth" on its bill - it gave me quite a shock! Are ducks really the only birds that have teeth? What's the purpose of those teeth for? Are the teeth directly attached to the bone? And if a duck bites you, does it hurt (how much, because of the teeth?)? Images of ducks' teeth: Below: Looks like a white capercaillie. Below: A merganser's skull (with teeth?!). Any help would be happily appreciated!