Snake And Frog Friends

Friendship is also found among animals of higher intelligence, such as higher mammals and some birds. Cross-species friendships are common between humans and domestic animals. Cross-species friendships may also occur between two non-human animals, such as dogs and cats.
A study conducted by Krista McLennan, a doctoral student at Northampton University, investigated friendship in cows. McLennan measured the heart rates of cattle on three separate occasions to determine their stress levels. In the first trial, the cows were isolated from the rest of their herd. The second trial penned the animal with another cow that they were familiar with. Finally, the third trial put two random cows together. Her research showed that the cows were much more stressed when alone or with an unfamiliar cow than they were with one of their friends. This supports the idea that cows are social animals, capable of forming close bonds with each other. McLennan suggests that if farmers group friends together, it could benefit the cows by reducing their stress, improving their overall health and even producing a greater milk yield.