A big raptor, with a personality.
Below he threw his head all the way back, part of the Cara Cara mating movements. He was flirting a little.
The Lore and Ceres around his bill is a yellow color here. If they are upset, angry, or aggressive it turns to a red coloring.
Avian Conservation Center, South Carolina.
The emotional colour change thing sounds interesting.
I will look to see if I have any photos with red. He was upset with the handler at first, so maybe there.