Recently in Tampa, Lettuce Lake Park has a great boardwalk for nature photographers and while observing the Black-crowned Night Heron, I learned something.
This is just an observation guess… notice what the bird does while its beak is in the water. My guess is that by gently snapping into the water creates a vibration which will bring fish or other species from underwater to the surface.
Pretty neat!

Juvenile Black-crowned Night Heron | Alice Mary Herden | January 2019
Links:
https://www.allaboutbirds.org/guide/Black-crowned_Night-Heron/overview
https://www.audubon.org/field-guide/bird/black-crowned-night-heron
Categories: Birds, Wading Birds