This is a domestic mallard. There are many of these that are living in the wild, either escaped or released - people get their kids ducklings for Easter, not realizing that they grow into ducks.

When they're not cute anymore, they dump them in a pond.
Breed refers to varieties within a species of domestic animal - breeds are created by selective breeding by man. Species are a classification within a genus, like mallard, Canada goose, northern cardinal, etc.
Liam might be along to tell you what breed of mallard this is!