Anita Sethi on the Dunlin

On a summer walk in Upper Teesdale on her way to the great Cow Green Reservoir, nature writer Anita Sethi realises she is lost. Without her map, she turns to nature for a sign of where she is, and is rewarded with the call of the dunlin.

Once known as the red-backed sandpiper because of their rusty-red and black summer plumage, dunlins are small waders that nest on upland landscapes in the summer months, where peaty pools provide habitat for food. In the winter, their plumage transforms to greyish-brown and white. They can also be found on the UK's coastline and estuaries all year round.

Despite their relatively small size, dunlins are capable of producing a very loud song. Anita follows the bird's low burrs and high trills and eventually finds herself at the edge of the vast reservoir, nestled between the North Pennine hills - a perfect spot for birdwatching.

Presented by Anita Sethi and produced by Jo Peacey. A BBC Audio Bristol production.