A Waddling of Ducks

Ducks are waterfowl that are found on both fresh and sea water on every continent except Antarctica. They are able to fly except during their 20- to 40-day molting period. They can turn off half their brain and sleep with one eye open, alert for predators. A duck’s feet have no nerves or blood vessels, so they do not feel the cold. Ducks have excellent sight and can see in color. They have three eyelids, and because their eyes are on the sides of their head, they have a field of vision of 340 degrees. Although rare, ducks have been known to change their sex when there is strong gender imbalance in their flock.