i have a mallard duckling that hatched last night around 12 hours ago. It was hatched with the yolk not fully absorbed and it was also ruptured with a small amount of tissue outside of the umbilical area. i tied this off and left the duckling in the incubator and this morning the yolk sac and tissue had dried up and i removed it. Now the duckling wont stop shaking violently, it looks like its feet are vibrating! It also cannot walk properly and keeps fallinf onto its back :/ apart from that its very vocal and very lively, what could be wrong? is it in pain and will it get better?