Cows Have Best Friends and Get Stressed When Separated

It turns out cows are a lot more socially sophisticated than your average barn stereotype would suggest. These large, grass-chewing mammals form genuine friendships — preferring specific individuals within their herd and choosing to spend time near them over others, even when the whole pasture is available.

Researchers at the University of Northampton put this to the test by pairing up dairy cows and then separating them. When best friends were kept together, both their heart rates and stress hormone levels stayed low. But the moment they were split from their preferred companion? Heart rates jumped, cortisol levels rose, and they produced measurably less milk. That's not just stress — that's heartbreak with data behind it.

It gets more endearing: cows who were reunited with their friends after separation showed visible signs of relief, grooming each other and standing closer than usual. Scientists call these bonds "affiliative relationships," which is the academic way of saying "yes, they really do have a barn bestie."

So next time someone calls you a cow for being too attached to your friends, take it as a compliment. Apparently, loyalty and deep social connection are core features of the bovine lifestyle — and the science wholeheartedly agrees.