A duck’s life

According to Ducks Unlimited Canada's FAQs:

13. What is the correct term for a group of ducks?

There are several different terms used to refer to a group of ducks. Mostly, it depends on what species of ducks are in the group. Paddling, skiff, raft, team and dopping are just some of the terms used.

It also depends on whether the group is on the ground or in flight. For example, a group of mallard ducks on the ground is call a “sord”, but when in flight, it is called a “flock” (as are all ducks in flight).

But WikiAnswers.com says: A group of ducks is called a "gaggle."