I have had a pair of grey call ducks for about 6 months now, and last weekend I got a pair of wood ducks. I put them all in the same pen (8ft by 12ft), and the poor wood ducks have been mercilessly chased and when they could catch them, feathers pulled by the calls. At first it was just the male call doing it, but now they both are. The poor woodies are forced to stay in hiding under the edge of the pool. Is this something that will stop eventually?