We did process two of our male ducks the other day... haven't had duck in a while.
Neighbors gave us 5 ducks and we raised them in the chicken electric fence not know which were male/female. After a while the males make a different sound than the females so we could id them. Our church has a group process day a few times a year where you take your foul and everyone works to process them.
My search engine is "Duck Duck Gone".... (ok, bad joke).