So.. we went away overnight for 24 hours.. 22 ducks in their 300 sq foot pen, and as soon as we gte back, we let them out for forage and swim. We have an acre of spring-fed pond that is up to 20 feet deep in places. We have three catfish, 3 large grass carp and a bunch of Koi.. all the ducks doing what they normally do.. rushing headlong like crazy things to the water.. hubby is down by the pond clearing one of the flower beds. Doesn't see or hear anything unusual. I am in the kitchen, 20 yards up from the pond and suddenly hear a non-stop blackbird alarm call and the two Guineas creating a racket.. not sure if that would be of significance. I go and check, scanning the pond and count the numbers. The ducks are all on the south side of the pond.. and I am missing a Campbell.. I scan the pond and on the north side, I see her.. running around, she is up against the bank on the north side. and is floating with her head stretched out underwater. I drag her to shore.. no breath, no heartbeat.. she is dead Not long though.. no rigor, and she is still warm. Holler for hubby and we start checking for signs of injury.. nothing. Nothing in her beak.. no signs of any pond weed entanglement.. her neck is not broken. No mucus, no signs of fractures. She WAS passing a normal stool as she died. Hubby is autopsying her for clues. All we have found so far is one tiny puncture wound in the skin of her left breast..but even that could come from feather removal. No sign of bruising either. Feeling I've let this baby down somehow.. and want to make sure that I don't lose another one.. any ideas as to the possible cause of her demise would be appreciated..