So, last night I put my 4 4 week old ducklings (Peking) out to their nice new fenced in yard, and they just swam in the 50gal rubbermaid pond most of the time. Came back from dinner, and we are down to 3 ducks. No signs of struggle or anything else. I am thinking an owl that time of night, but a duck is pretty big! Might sit in the coop with a shotgun tonight just incase whatever it was is still hungery.