Dozens of birds have returned to a nature reserve after a 4,000km migration from Africa.

Sand martins have been building nests in the banks at the Arundel Wetland Centre, run by the Wildfowl and Wetlands Trust.

The birds have been returning each spring since 2017 to raise young in the nesting banks built directly into the wildlife hide.

Every spring, sand martins move through the nature reserve, returning from winter homes in Africa and Europe as part of mixed flocks with house martins and swallows.