Bird Photography: Flash & No Flash

It always amazes me how much impact the flash can have on photos of birds in the forest.

Palm tanager; with a flash Costa Rica; Sarapiqui
Palm tanager; with no flash; Costa Rica; Sarapiqui

Both were photographed with the following settings: Aperture Priority, F/8, 1/400 sec shutter speed, ISO 800, Canon 580 flash, 100-400mm lens.

The flash is set to TTL and high-speed.