there's a second juvenille one hiding off to the right in this photo, too
33 min before sunset, observed 2 individuals. Accidentally flushed from brush on edge of shallow pond, bird made no wing noise or vocalizations. Seemed to be solid cool grey color. With long legs, neck, beak. No difference on color on wings or back. Roughly twice the size of a mourning dove. Juveniles?
Flew in very dark still
INat suggested American Bittern. I think juvenile Black-crowned Night Heron.