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You should get then indoor and keep them warm... if they are cold for more than 2 and a half hour they are dead... but if they hatch within a mouth they got lucky! GOOD LUCK!
if th duck egg is cold or cracked there is no hope. but, if there is still warmpth then there is hope. you can either wait till the mother comes back (if she does) or you can take it in.
you first take it home, then you take out a cooking pan(nonstick) then u fry the egg for 200,000,576 seconds at 470 degrees f
to find out how to serve it go to madlypink.com