Blood-sucking 3ft-long vampire fish with razor-sharp teeth thriving in UK rivers
Lampreys can grow to over 3ft-long and return from the sea to breed in rivers in May meaning anyone Brits eyeing up a swim in their local river ought to be on alert
Lampreys can grow to over 3ft-long and return from the sea to breed in rivers in May meaning anyone Brits eyeing up a swim in their local river ought to be on alert