I wish I had thought to try a video. We were in our skiff, moving up a small blackwater tributary of the Peruvian Amazon. As we proceeded upstream, egrets and herons began coming from their roosts in the forest and flying ahead of us, until there were thousands of them leading us up the creek. This image doesn't really tell the story, but is just one of the multitude coming out of the rainforest to join his comrades, and reminding me what a spectacular moment it was.
D7200, 500f4 + 1.4 TC, ISO 1600, 1/1600s @ f/7.1 manual. Full height cropped from horizontal.