What are predators of harlequin ducks?

the same predators of any other duck breed for babies you have to worry about hawks, raccoons, opossums, snakes, dogs, and cats and for adults Coyotes, dogs, bobcats, wolves, panthers, Tasmanian devil, mountain lions, cougars, foxes, and and large cats like Debbie (my big cat!)

The reason I didn't put all of these animals on the duckling list is a duckling should be kept inside and be taken out daily IF NOT RAINING! and should run around NOTE: never leave your ducklings outside alone for very long or the lists of animals could get them and you can let your ducklings (if you have some) out to roam at about 4 weeks. Sorry for all of the useless info I just want you if you have ducklings to be safe and keep everyone that had ducks safe once again sorry for all of the useless info.