This study examined seed dispersal by mallards through feeding trials. Seeds from various wetland plants were fed to captive mallards and their fecal samples collected every 4 hours for 48 hours. Recovered seeds were planted and monitored for germination over 60 days. Most seeds were recovered within 24 hours. Control seeds generally germinated better than fed seeds, and germination declined with gut retention time for some species. Mallards were found to be effective dispersers for most studied species, with variation relating to plant reproductive strategies and habitat preferences.