posted 6 years ago
It really depends. If you stuck food at one end, and they saw you do it, they'd go in. But, ducks like to stretch their wings.
I had to convert the cm to inches, as my brain isn't as versed in cm. (for others like myself, it's almost 4 feet wide and just over 3.5 feet tall). The wingspan of a muscovy is 4.5-5 feet, so they wouldn't be able to stretch their wings. So, they probably wouldn't spend too much time in there.
BUT, I've found that with my mallard ducks, that after a year of having them on my property, they've destroyed the slug population so thoroughly that I don't see slugs, even far away from where they usually roam.
How big is your vegetable patch? It may be that just by having the ducks near it, they will eat so many slugs that wander over to them, that they will pretty much destroy the slug population, without having to spend the time and expense of making a duck tunnel.