Two of my muscovy drakes -- coming up to 1 year and coming up to 2 years old -- have started running up and down flapping their wings when they first get out of the coop, in the morning. They used to do this previously but stopped over the summer. I don't think either will have useful flight, though, as they are too heavy. The third muscovy drake, coming up to 2 years old, doesn't bother to try and fly at the moment but has just had a long and debilitating molt. He has now got all his new feathers and is regaining his moxy, so perhaps he, too, will start the wing flapping game soon. I had assumed that the two that are wing flapping while tearing up and down the backyard were thinking of taking off in search of females. As the older of the two never flew away last year when he was younger and lighter, I don't think he will have any useful [ie ability to escape] flight. The younger boy had a wing clipped by a prior owner and so he won't be able to attempt to fly until after he has molted.
In contrast my son has three pekins that all -- 2 females and one male -- run up and down flapping their wings at 2 years old. His smallest -- a crested pekin -- can fly across the back yard but doesn't gain altitude. She just flies over her mates when trying to get to the mealworms being offered as a treat! His larger female and even larger drake have never had any flight, unless coming down hill off the top step into the garden!
