I have three pairs of ornamental ducks. While I was changing their pond water today I did my daily inspection of the aviary and caught a couple to check on them. I do this since my chiloe widgeon and ring teal are from South America. After this was done I found a small amount of blood in the snow. There was only 1 tiny drop and a couple pin specks. I rechecked all the duck and found no blood. So, when ducks come into breeding season, do they have a period so to say?