National Trust creates Northumberland ‘ark’ to protect endangered crayfish

Trust creates refuge for white-clawed crayfish in old cattle drinking hole on Wallington estate near Morpeth

An ark" refuge is being created by the National Trust to help save one of the UK's most endangered native species from extinction.

The white-clawed crayfish is the UK's only indigenous crayfish but the population has been almost wiped out because of the introduction of a bigger American species in the 1970s.