This is
Heron that is so called because it is in Europe.
PIC taken in Netherlands.

And this is
Heron that is so called because it is in America:
Pic taken In US:
They appear to be different species from WIKI, but I just don't know the difference. The plumage color for both birds are Grey/Blue. The European Grey Heron is also distributed in Asia.In China,people call it 苍鹭。
Is it because that people don't believe that Heron can flight cross the ocean?