sanderling

sanderling

Observation - sanderling. Description: the two birds have differant shades of colours on there backs ,one on the left is very dark one on the right is very light, is this there change to winter plumage or is one a juvenile

the two birds have differant shades of colours on there backs ,one on the left is very dark one on the right is very light, is this there change to winter plumage or is one a juvenile