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We need to know more about the situation. How is the duck?
Type of shelter
access to water
how long this has gone on
type of food
any other ducks or ducklings?
Are these chicks or ducklings?
If they are chicks, try this thread http://www.backyardchickens.com/t/1137688/the-emergency-thread/410#post_17909661
Generally if ducklings have such problems it is because they are not able to wash their heads frequently.
Edited by Amiga - 1/4/17 at 7:24pm