This is my first for ducks..... and chickens.... and rabbits.... We have 6 Silkies (grown), 18 Red Pullets (not yet laying), 2 mallards, and 2 New Zealand/California rabbits. I dove in head first to the farming business lol. I have noticed a difference in their voices. Maybe I have a pair which would be awesome because they are inseparable! They will cry for each other if they are not close.