Sorry Wis... While I am pretty sure that the 10,000's of Cans that I watched with their heads were tucked under a wing.. WERE swiming into 3 footers... but in calm water... ???? I don't know... I guess I need to SCUBA under resting rafts of birds to find out....
But I need to know for a mount that I am doing.....
They just sort of hang there when not paddling. THey don't paddle much unless they are really moving. Here is a video that shows the feet. I think they are geese not ducks but same thing. http://www.youtube.com/watch?v=ohdap56HwpQ
Either way their feet are still under them. :>) :>)
Seriously, I can't say for sure but my money would be that the legs would be extended so that the feet and legs would act more like a keel even if actual swimming was not required at the time. I just don't think they tuck them up when in the water, ever.
Phil
Seeing your question is a serious question I would say hanging down. To retract their "gear" as such there has to be a conscience muscle contraction to bring them up and that would be relaxed while sleeping, so hanging down. Nothing like the time landing an aircraft when I got no indication that my gear was down. I made the softest landing of my life. I did change my shorts however.
wis boz
Phil - You probably know this but I was interested to see that divers are not as good walking on shore as puddlers (hatching young) and apparently divers feet are farther back toward the tail which, I think, helps them to swim down to food at greater depth.
What they do with their "flippers" when asleep on the water - I have no idea, but it looks as though you are getting plenty of help with that !
sarge