DUCKS generally sport a huge penis, often longer when extended than the length of the whole bird otherwise 　[　https://www.discovermagazine.com/planet-earth/ballistic-penises-and-corkscrew-vaginas-the-sexual-battles-of-ducks　]　
　「Medical treatments, sick penis contained, stretched skin of crotch, queefing sounds」with「birds」equates GULLS with service providers. Ducklings have webbed feet as did dynastic Chinese service providers and concubines:「Gulls are typically medium to large birds, usually grey or white, often with black markings on the head or wings. They typically have harsh wailing or squawking calls, stout, longish bills, and webbed feet. Most gulls…are ground-nesting carnivores, which will take live food or scavenge opportunistically. Live food often includes crabs and small fish. Gulls have unhinging jaws which allow them to consume large prey. …The large species take up to four years to attain full adult plumage, but two years is typical for small gulls. Large white-headed gulls are typically long-lived birds, with a maximum age of 49 years recorded for the herring gull. Gulls nest in large, densely packed noisy colonies. …Gulls—the larger species in particular—are resourceful, inquisitive and intelligent birds, demonstrating complex methods of communication and a highly developed social structure. For example, many gull colonies display mobbing behaviour, attacking and harassing would-be predators and other intruders. Certain species (e.g., the herring gull) have exhibited tool use behaviour, using pieces of bread as bait with which to catch goldfish, for example. Many species of gull have learned to coexist successfully with humans and have thrived in human habitats. Others rely on kleptoparasitism to get their food. Gulls have been observed preying on live whales, landing on the whale as it surfaces to peck out pieces of flesh.」
　　[　https://en.wikipedia.org/wiki/Gull 2014-11-16　]　

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: wigeon (Anas penelope, a Eurasian duck); seagull (arch.)
Unihan extended: seagull
EDRDG: seagull