Ok so I have about a week old pekin ducklings and we have moved them to a dog crate because they are veryy messy and cardboard absorbs water and it started to stink. But anyways we have them just outside of our door and we were worried the older ducks Woupd scare them, and what I'm asking now is what would be considered aggressive behavior for the male duck towards the ducklings? Because we let them out this morning and he heard the ducklings and he came running towards the cage I scared him off. But I let him come back cuz I wanted to see how he acted with the ducklings. (they're still in the crate) but at first he approached them and he'd peek in through the holes circling the crate non stop. then he'd leave, to go swim drink whatever then come back peek in quack a little then started to just sit beside of infront of the cage. What would that mean?