Yup, hence we're keeping them until we've got a viable breeding population.
They are trippy, quite smart, very tough. Pretty much useless for egg production but eat almost anything including raw taro, which is a cautionary note. They'll eat banana stalks right down to the ground too, so it's worth having plenty. They can fly like a mallard if they want to, which is seldom, but I've seen mine occasionally waiting for me to come home a half mile away at the intersection. When the get in the air they blaze like a mallard, probably 50+ mph, very fast for a bird. Dogs can't catch them as they'll rise vertically. The drakes are a lot slower as bigger and are loath to fly, but can.
More goose than duck. I hear Heyerdahl's ghost again, whispering over my shoulder.