This is a favorite bathing  spot for many birds. Today a European tree sparrow bathes near a green sandpiper. Earlier, a white wagtail, (hakusekirei) perhaps,  and an oriental greenfinch, (kawarahiwa) enjoyed a bath in the same location.

12/29/15 The green sandpiper is a cheerful bird, constantly bobbing it’s tail as it searches for small invertebrates. I often see it along the river near my house gleaning for small prey along the banks. In this video, I added the call of the green sandpiper to the sound track. You can hear it as a cheerful “piyo piyo piyo piyo”!