My ducks arrived from McMurray hatchery on wednesday afternoon. one of the ducklings arrived very weak, I thought I was going to lose it, but it perked up after eating and drinking. The only problem now is that it can stand or walk. It kinda just paddles its self around the brooder like it is in the water. Any idea on whats wrong? She has showed no improvement over the last few days. any ideas on how to help her out?