Ninja assasin cows

At first this looks like 3 cows eating straw but look closely. The 2 black cows have snuck under the middle one and have her in a strangle hold. She even has her tongue out as she struggles to breath !

I think that the farm has been infiltrated by Ninja Assassin cows.

Its a dog eat dog world on the farmyard you know. Well cow eat cow. . . no hang on Cows are vegetarians, so maybe its a Cow eat Grass world.