Kurosagi (クロサギ) in Japan
These birds come in two colors black or, white.
The white one would be called a shirosagi. They are Egretta sacra, in Latin terminology.
Most of the time, I have observed these birds, they eat fish.
This one, caught a few then, switched its diet to some freshwater prawn.
More about Egretta sacra at ARKive
