their fur
Mallards and other ducks (and swans, and geese) migrate yearly. During the winter, they fly south to warmer areas so that they can still live on open water and find food. They fly north again in the springtime.
It's hard for them to find food and because the cold can kill them
ducks are warmblooded
plants need cold water to survive
well polar bears don't live in water so it would make since if they have cold water to survive so yes the water has to be cold It would seem they could live anywhere, the water at the zoos isn't that cold and they reproduce too!
Shooting anything is cruel. In the case of ducks, it kills ducks, which is cruel. It can also leave ducks that survive with a serious injury that is extremely painful and difficult for them to live with.
They've got literally tons of blubber that insulates them from the cold.
they have a tiny bit of hair which helps them stand the water. They are born in cold water too.
Salt water, water that is too hot or cold or has chemicals in it
Food, water, and a cold environment!
No...its way too cold for them to survive.
On average, about 50 of baby ducks survive in the wild during their first year of life.