Look at the voice: females usually have a loud quack; males usually have a softer, raspy sound
Check the tail feathers: males of many breeds have a curled “drake feather” at the end of the tail
Observe body size: males are often larger and bulkier than females
Compare head shape: males often have a thicker, more rounded head
Watch behavior: males may be more aggressive or territorial, especially during breeding season
Look for breeding plumage: males often have brighter or more distinct coloring in some breeds
Check the bill color: some breeds show sex-related bill color differences
Examine the vent area: vent sexing can identify sex, but it should be done by an experienced person
Consider age: ducklings are often hard to sex by appearance alone
Use DNA sexing or a vet exam for the most accurate identification