Little Blue Heron

Adult Little Blue Herons are very dark all over. At close range or in good light, they have a rich purple-maroon head and neck and dark slaty-blue body. They have yellow eyes, greenish legs, and a bill that is pale blue at the base, black at the tip. Juveniles are entirely white, except for vague dusky tips to the outer primaries. https://www.allaboutbirds.org/guide/Little_Blue_Heron/id#