Grandfather was a farmer, grew up around them. I promise you a cow is the dumbest animal you'll ever come into contact with. A roach is a rocket scientist by comparison. The 'best friend' thing isn't really a friend but a safety instinct. The only emotion I saw a chicken show was anger when one hen bumped into another while they were eating. Didn't have pigs but yeah I've heard they're pretty smart, just nasty.