Everything was fine all day then my boyfriend came home from work at 6:00 pm checked on our babies and one duckling was being picked on. Took him out, he was pretty lame and floppy but let us hold him and love him. Separated him and put him in a box and kept him close to us. Time for bed he was rolling over on his back. Decided to put him in bed with me and he laid on my chest. He flopped a bit shook and then finally died. He felt warm. No signs of injury, he didn’t even poop when he died. Had clean water and food. Just got him Sunday and this isn’t my first round with ducklings so I’m really uncertain what went wrong here. Is there a disease or just a weak system? I got him and one more from TS on Sunday and got 2 more from a different TS yesterday and this happened. I’m not sure if that makes a difference.