Saw this great blue heron before dawn, and used a speedflash to illuminate the heron against a dark background. Surprisingly, the flash doesn't disturb the animals, even beavers up close.

Canon EOS 80D with EF 100-400 mm f/4.5-5.6 L ISII USM lens at 200 mm and Canon 430EXIII-RT speedflash; 1/60 second at f/5.0, ISO 3200.