Tricolored Herons are in constant motion as they feed.
Occasionally showing off their full neck span:
When the catch is this small you need to feed continuously.
I passed this fellow a couple of times over the course of an hour or more, and he was just working his way back and forth in the shallow water.
A slight pause, watching for movement in the water.
Donnelley Wildlife Management Area, SC
October 17, 2021