Holy cow!

What a great story!  A farmer in Ireland was baffled - each night he would lock his herd of cows up, but each morning he would find them roaming around outside.  He suspected some local lads might be responsible, so he rigged up a CCTV camera - and would you believe, one of his cows has learned how to undo the two bolts which locked them in with her tongue!  Almost beggars belief but you can see it for yourself on YouTube