Question #145599. Asked by Creedy.
Last updated Mar 20 2018.
Originally posted Mar 17 2018 6:54 PM.
Designed primarily for paddling, the legs of waterfowl are set back on the body. It's that placement, along with their large webbed feet, that gives the birds their characteristic waddle when they walk.
http://www.ducks.org/conservation/waterfowl-research-science/understanding-waterfowl-ducks-in-motion