this is our parents 3rd batch, now we have a 2 1/2 month old cygnet that they are banishing from the pond.He is one of 7 cygnets, he is large, looks healthy, will run into the pond to eat when i feed them. after they eat the parents will recognize him and chase him out of the pond. i tried putting hime in a pen but that made everyone unhappy. We don't know what to do?