You can spot the birds very easily because their black and white color and their cute movements.
They are Japanese Wagtail or Black-backed wagtail (Motacilla Albalvgens) and indigenous to Japan.
Legend states that their presence in Japan can be traced back a thousand years.
The Kojiki, Record of Ancient Matters, written in the early 8th century (711–712), explains how islands of Japan ware created by a god and goddess.
And it is said that the wagtail is the first bird to come and live in the newly created islands of Japan.
It is also said that the wagtail taught the god and goddess how to make babies, and thanks to bird’s help, they produced many children!