http://www.telegraph.co.uk/news/2016/05/01/death-from-above-the-ravens-slaughtering-newborn-lambs/
From last year but it’s been on the farming news lately as a problem in Devon and Dorset in particular. Eyeballs and toungues are tasty and easy to get as mentioned. Farmer on interview lost 20 ewes last year with flocks of ravens attacking at once. So yep they can be a pest.
They’re protected so the traps are the only legal method, although it was mentioned a limited licence to shoot was being considered. Apparently members of the crow family are quite tricky to hit though.
If there’s one thing I’ve taken from moving into a rural area, it’s don’t mess with what you don’t understand. Those who destroy the traps are no better than the hippy idiots that released mink into the wild.
If you don’t agree and think it’s illegal, photo it, report it and let someone who knows decide.