All of the banners and many of the photos were provided by Greg Lavaty. His work in Costa Rica (and elsewhere) is always stunning. He has been enormously generous.
Other photographers that I use regularly include Annika Lindqvist, who takes "keeper" images of everything that moves, Bruce Hallett and Lora Render.
I take all the uncredited photos, usually of locations, since I'm too embarrassed to put my bird images next to these people.
Crimson-collared Tanager - Greg Lavaty
Agami Heron - Greg Lavaty