Sandmartins nesting colony on riverbank.

Sandmartins nesting colony on riverbank.

Observation - Sandmartins nesting colony on riverbank. - UK and Ireland. Description: Hard to see on my photo - but those bird-shaped blurs are the Sandmartins busy flying in and out of their nest-holes and catching flies across the river surface. Sandmartins have white underparts and brownish above.(The narrow channel seen here opens onto

Hard to see on my photo - but those bird-shaped blurs are the Sandmartins busy flying in and out of their nest-holes and catching flies across the river surface. Sandmartins have white underparts and brownish above.(The narrow channel seen here opens onto the wide river).