Someone brought this bird to me today saying they found it in the parking lot at work,. which happens to be right across from a fishing lake where I care for some animals. Its very calm and is comfortable being held, so I don't think it's wild. It looks like a duck of some sort. It's very small. Fits in the palm of my hand, but is fully feathered. The bill is wide at the tip, but I don't know if that's normal or if it's an injury. It seems to have been attacked by something. The bill looks swollen and feels squishy around the top front area and looks possibly infected when looking inside. I can also feel some kind of injury on its back. Any advice or a breed ID would be greatly appreciated.