I can safely say, the more you see them, the more you learn about them..
Some times, I see the common waterhen, where the face are dirtier, I tought it was from digging the mud somewhere. Later I learn they are the juvenile or immature birds.
They have lovely black eyes, dont they?
The juvenile birds are more bolder and easier to shoot(by camera of coz) than the adult, which tend to be more cautious..
An adult by the water edge.
I had to stay very still behind some reeds to get this..