I have two sets of ducklings. Some eggs I bought off next door and some of my own I hatched. I have them in separate brooders next to each other. They are all fed watered changed and treated the same. Yet their personalities are total different. The next door ducklings scream run and are afraid of everything. The ducklings I bred are wary but curious and like being fed and changed. The others scream their way through every feeding. I find this curious.