This was funny. I assume there were eggs in this nest box, and maybe hatching while I shot these.
He was determined to keep looking inside.
After peeking inside, he would drop down to the water, swim in a circle, and fly back for another look.
Young Wood Ducks will jump, with no fear, out of the box the moment they can move around. Once out, they never go back. They can’t fly yet. With luck they make a soft landing.
As soon as they crash from the nest they are out swimming and learning to find food.