CA Food & Agric Code Section 25855

The following are the various classes of ducks:

(a)

“Duckling” means a young duck of either sex (usually under 10 weeks of age) that is tender meated and has a bill that is not completely hardened and windpipe that is easily dented. This classification may include broilers, fryers, or roasters.

(b)

“Duck” means a mature duck or an old duck (usually over 10 weeks of age) of either sex with toughened flesh, hardened bill, and a hardened windpipe.