Hepadnaviruses can cause both acute and chronic liver diseases in ducks.

So the incidence of lead poisoning in black ducks over there is like 54 percent higher than the national average.

A slim young man in white ducks appeared behind her.

He turned to a powerful-looking man in white ducks.

The virus could not be clinically reproduced in ducks.

Still, the disease persisted in domesticated ducks in coastal China.

This is a very unusual behavior in ducks for both parents to help raise the young birds including direct provision of food to young.

In ducks, and apparently in people with syndactyly, this does not happen.

Clinical disease only occurs in young geese and ducks between birth and 4-5 weeks of age.

"we'll be in the open in a few minutes and sitting bloody ducks."