They're available
from most pet stores. Think they're classed as Geese-feed. Although larger ducks may also appreciate the cuisine.
(
Tarquin.,
Sat 17 May 2003, 14:13,
archived)
can they also be used
as a swan decoy? those swans are savage!
(
freshlegs,
Sat 17 May 2003, 14:24,
archived)