This muscovey duck follows this trumpeter swan every where it goes, I think it was love at first sight. ( photo / image / picture from Kildale's Garden )
As long as both birds are happy in each others company than that's all that matters. They do look rather good together don't they?
Could be self preservation on the ducks part. He is not easily noticed when close to the swan. Like the difference between a steak dinner and an appetizer. Predator will go after the swan,,duck gets away.