why do ducks changes for the winter?

Answer 1

are you asking if they change their plumage? Yes, they do. The males do at least. They are much more brightly colored in the spring for breeding season so they can attract a female. Some species even change their bill color. The male ruddy duck has a sky blue bill in the spring, but in the winter it fades. See the links below to see the difference in a breeding and non-breeding male.
http://pie.midco.net/dougback/miscphotos/ruddy_duck.jpg
http://www.geocities.com/tgrey41/RuddyDuck7.jpg

Answer 2

Most birds -- not just ducks -- change for the winter. It is called molting, as several posters have noted. It has to do both with breeding -- and with refreshing the worn-out feathers.

From Long Island Birding.com:

"Molting – when the birds replace their feathers – is usually done at least once a year., and is necessary to replace old and worn feathers. Molting becomes possible when the feather becomes weak in it’s follicle (like our hair follicle) and a new feather grows in it’s place, pushing the old feather out. However, since feathers are for flight and protection, molting must be done when it is easiest and safest for the bird. It also takes a great deal of energy to molt. Usually birds molt when demands on their survival are at a minimum (when food is abundant and other activities like breeding and migrating are not an issue). Therefore most birds molt after breeding and, for those that migrate, before migration begins. Most birds molt slowly, losing small amounts of feathers at a time, so that their ability to fly is not hindered. However, most waterfowl molt all at once and therefore become flightless for weeks at a time. (They become very secretive at this time.)"

Hope this answers your question.

Answer 3

what do u mean change like goes some where else if that's what u mean thy go some where else cause theres no more grass for them to eat so thy go some where else

Answer 4

I'm not understanding this question. Are you talking about migration or molting?

Answer 5

to keep warm and conserve energy.

Answer 6

what do you mean by "change"?