I'd like to throw my suggestion into the mix of adding Sandhill Crane as a DLC waterfowl to Yukon Valley, Layton Lake, and Silver Ridge Peak, Mississippi Acres.
According to birdfact, they measure up to 1.2m (3' 11") in height and wingspan as wide as 2m 6'7"! Weights can vary between 3.2kg (7lb) to 5.4kg (12lb). They're a migratory species from far north as Alaska down to the Gulf of Mexico.
Calling them with lures from their high migratory patterns down to a field or lake would add another fun and different species to some existing maps. Adding decoys, lures separate from the existing dlc's would be appropriate I think.