I might be just worrying about nothing but one of our ducklings fell the other day. He seemed fine and was acting very normal. Since then he seems to have gotten quite fat, in comparison to our other duckling he is very big. He also keeps resting on the back of his legs, he will walk/run for a bit but then sit down. We have checked his legs, pressed all over him and he never makes a peep. Is he just lazy and eats a lot? Or could this be related to his fall? If not, should we just give him more exercise? Thanks for the help.