My geese were raised with ducks so they're quite tolerant. There are only problems when the geese have nests or goslings and then become more aggressive so should then be separated. I also keep them separated by fencing in the barn each night. They get along great in a large pen or free-ranging.

I have one American Buff goose and he does quite well here with a heated bucket in his pen. I don't think geese or ducks need to be able to swim in a pool in the winter. My understanding is they need to be able to submerge their head and blow out their nose and get their eyes wet. I use a kiddie pool in the summer here, but out winters are brutal and he does fine with his heated bucket in his pen and a large water bucket out in the yard. He will take a bath in that bucket when it is below freezing and he still enjoys it. I bought his heated bucket from Big R for about $12.00 although it is smaller than you would need. But they make all different sized ones.

obviously this is a little late, but here is a section of the illinois wildlife code. imho, it includes damaging nests of native and specifically birds of prey. does your state have anything similar? am i wrong? "520 ILCS 5/2.2) (from Ch. 61, par. 2.2) Sec. 2.2. This Act shall apply only to the wild birds and parts of wild birds (their nests and eggs), and wild mammals and parts of wild mammals, which shall include their green hides, in the State of Illinois, or which may be brought into the State, that are hereby defined as follows: All birds, both game and non‑game (except the House Sparrow, Passer domesticus; European Starling, Sturnus vulgaris; and Rock Dove or Domestic Pigeon, Columba livia). GAME BIRDS‑Ruffed grouse, Bonasa umbellus; Sharp‑tailed grouse, Pediocetes phasianellus; Bobwhite quail, Colinus virginianus; Hungarian Partridge, Perdix perdix; Chukar Partridge, Alectoris graeca; Ring‑necked Pheasant, Phasianus colchicus; Greater Prairie Chicken, Tympanuchus cupido; Wild Turkey, Meleagris gallopavo. MIGRATORY GAME BIRDS‑Waterfowl including brant, wild ducks, geese and swans, Anatidae; rails, gallinules and coots, Rallidae; snipe, Gallinago gallinago; woodcock, Scolopax minor; pigeons, including doves and wild pigeons (except domestic pigeons), Columbidae; and crows, Corvidae. RESIDENT AND MIGRATORY NON‑GAME BIRDS‑Loons, Gaviidae; grebes, Podicipedidae; pelicans, Pelecanidae; cormorants, Phalacrocoracidae; herons, bitterns and egrets, Ardeidae; ibises and spoonbills, Threskiornithidae; storks, Ciconiidae; vultures, Carthartidae; kites, hawks and eagles, Accipitridae; ospreys, Pandionidae; falcons, including the Peregrine Falcon, Falconidae; cranes, Gruidae; rails and gallinules, Rallidae; all shorebirds of the families Charadriidae, Scolopacidae, Recurvirostridae and Phalaropodidae; jaegers, Stercorariidae; gulls and terns, Laridae; cuckoos, Cuculidae; owls, Tytonidae and Strigidae; whip‑poor‑wills and nighthawks, Caprimulgidae; swifts, Apodidae; hummingbirds, Trochilidae, Kingfishers, Alcedinidae; woodpeckers, Picidae; kingbirds and flycatchers, Tyrannidae; larks, Alaudidae; swallows and martins, Hirundinidae; crows, magpies and jays, Corvidae; chickadees and titmice, Paridae; nuthatches, Sittidae; creepers, Certhiidae; wrens, Troglodytidae; mockingbirds, catbirds and thrashers, Mimidae; robins, bluebirds and thrushes, Turdidae; gnatcatchers and kinglets, Sylviidae; pipits, Motacillidae; waxwings, Bombycillidae; shrikes, Laniidae; vireos, Vireonidae; warblers, Parulidae; European Tree Sparrow, Passer montanus; blackbirds, meadowlarks and orioles, Icteridae; tanagers, thraupidae; cardinals, grosbeaks, finches, towhees, dickcissels, sparrows, juncos, buntings and longspurs, Fringillidae. GAME MAMMALS‑Woodchuck, Marmota monax; Gray squirrel, Sciurus carolinensis; Fox squirrel, Sciurus niger; White‑tailed jackrabbit, Lepus townsendii; Eastern cottontail, Sylvilagus floridanus; Swamp rabbit, Sylvilagus aquaticus; White‑tailed deer, Odocoileus virginianus. FUR‑BEARING MAMMALS‑Muskrat, Ondatra zibethicus; Beaver, Castor canadensis; Raccoon, Procyon lotor; Opossum, Didelphis marsupialis; Least weasel, Mustela rixosa; Long‑tailed weasel, Mustela frenata; Mink, Mustela vison; River otter, Lutra canadensis; Striped skunk, Mephitis mephitis; Badger, Taxidea taxus; Red fox, Vulpes vulpes; Gray fox, Urocyon cineraoargenteus; Coyote, Canis latrans; Bobcat, Lynx rufus. OTHER MAMMALS‑Flying squirrel, Glaucomys volans; Red squirrel, Tamiasciurus hudsonicus; Eastern Woodrat, Neotoma floridana; Golden Mouse, Ochrotomys nuttalli; Rice Rat, Oryzomys palustris; Bats, Vespertilionidae. It shall be unlawful for any person at any time to take, possess, sell, or offer for sale, any of these wild birds (dead or alive) and parts of wild birds (including their nests and eggs), wild mammals (dead or alive) and parts of wild mammals, including their green hides contrary to the provisions of this Act. However, nothing in this Act shall prohibit bona‑fide public or state scientific, educational or zoological institutions from receiving, holding and displaying "

Domestic hybrids ... note the colored head and neck. If I had to guess, I's say Rouen with some Khaki Campbell or Orpington to get the tans. And Cayuga to get the deep green/blacl The Rouen duck looks a lot like a mallard but much larger. This is what happens to the cute ducklings they sell at Easter.