One of our little one week old call ducklings keeps falling backwards. He tries to stand strait and seems to stand to tall and falls on his back. In comparison to it's hatchmate looks like it's back and tail are not as long as the other one, like he kinda has a short body. He seems to get around pretty well as long as he is not trying to stand strait up. He swims fine when he has his swim time, but sometimes if he climbs out of the water onto my hand for a break he falls back in. On land, he gets going, and if he tries to stand up strait or run fast he ends up on his back flailing his little feet!