the seeds bought in stores are also coated with a substance to make people really sick. i would be cautious. the seeds naturally contain LSA which is a very close relative of LSD. thats the reason for the coating, to stop curious folk from buying seeds and just ingesting them. some varieties are a very strong psychoactive plant, some are just mildly active, don't knw how this would affect a duck but my guess is they are in for a trip if they eat a bunch!