This is interesting and wonder if there is some other approach short of killing them??

Hicks Lake mute swans will be killed

http://www.theolympian.com/2011/01/06/1496380/hicks-lake-mute-swans-will-be.html

The law:

http://apps.leg.wa.gov/WAC/default.aspx?cite=232-12-017
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