I'm so sorry for you. I had a red fox problem, mid-day, last spring. I too thought the wolf and coyote urine was keeping my ducks safe, so I thought it was probably a momma fox trying to feed babies. Once she found our little flock, she boldly came back again and again. I kept the ducks inside for almost a month thinking she'd give up, but once they were out again, the foxy fox came back. A neighbor tried a live trap for us, but the fox was smarter than the trap. I finally gave the remaining ducks to a friend and now our pond is a lonely place. Hope you figure something out. If you do, please share your info. I'm sure I speak for all us chicken, duck, goose people in wishing you safety for your little ones.