It’s important to approach the nesting tress at the right angle and height.
This guy missed the turn and had to start all over again. This meant a complete circle around a Cypress island.
All the rookery birds do it. The larger the bird the more precise the flight path. Some Great Blue Herons will fly straight up so they can drop down on the perfect spot. I assume that’s how they avoid any branches.
This one, he just made a mistake and needed to repeat the necessary steps.