Biology
Social Bonds and Emotional Responses in Cows
Quick fact
When cows are separated from their preferred companion—their 'best friend'—they show physiological signs of stress such as elevated heart rate and increased cortisol levels, and they may vocalize more and move around restlessly.
Why this is interesting
Have you ever noticed that some cows in a pasture always seem to hang out together? Could they actually be choosing their friends?