I once watched a hawk circling as he watched something on the ground. The orbits got tighter, bank angle got steeper, and then bank shot to 90 degrees, he pointed downward, and then furiously flapped his wings and recovered to level flight. Stall/spin while maneuvering at low altitude. One of the coolest things I’ve ever seen out in nature.
But the absolutely most amazing was was formation aerobatics by a pair of hawks. They flew side by side, broke to the outside and each did a climbing turn. As they reached the apex, they descended and continued the turn, crossing in the middle. The entire time, they were perfectly in synch with each other - mirror images, and crossed their starting point simultaneously.