Dozens of water voles have been released into the wild in Cornwall to help improve a wetland.

The Duchy of Cornwall said it released 80 water voles in the River Fowey at Restormel.

The rodents, which are the fastest-declining mammal in England, were declared extinct in the region in the 1990s, the duchy said.

It said larger and deeper pools created along the River Fowey through a nature programme since 2022 had made an ideal habitat for water voles.