They don't, at least not as far as scientists are aware of.
duckling and platapus
One of only two mammals on the planet to lay eggs! So even though they sort of look like duck-billed and footed beavers they are really just Australian mammals.
Duck-billed dinosaurs are called Hadrosaurs.
Knob-billed Duck was created in 1769.
Spot-billed Duck was created in 1781.
Duck-Billed Runners are a breed of Anas platyrhynchos domesticus.
A duck billed dinosaur is called a Hadrosaurid. They were the first dinosaur family to be identified in North America.
The real name for the "duck billed platypus" is just platypus. The "duck billed" part of its name is a nickname which gives a false impression that its bill is like a duck's bill.Its scientific name is Ornithorhynchus anatinus.
The duck billed platypus.
The duck fart refers to a softly hit ball just over the infield.
A mallard eat duck weed
A Duck Billed Platypus!