Dr. Katie Hancock provides exotic pet care here, and the clinic lists chickens among the exotic pets it cares for. Services include routine care, sick and injured care, and surgery. Ducks and waterfowl are not named on the page.
Dr. John Kaya at this Honolulu clinic treats small exotics, reptiles and birds alongside dogs and cats. His page does not name ducks or waterfowl, so waterfowl care would need to be confirmed with the clinic.
This general practice in Honolulu says its veterinarians see many species, including birds, reptiles and rodents. Dr. John Kaya has an exotic-animal interest and treats birds among his patients. The site does not mention ducks or waterfowl specifically.