Campaigners are tracking marine mammals in an effort to find out how many are being killed by fishing nets.
More than 120 dolphin and porpoise carcasses were found on the beaches of Devon and Cornwall between January and April this year.
Campaigners are tracking marine mammals in an effort to find out how many are being killed by fishing nets.
More than 120 dolphin and porpoise carcasses were found on the beaches of Devon and Cornwall between January and April this year.