As anyone who ever watched the Homeward Bound movies will know, animals are perfectly capable of forming strong and lasting friendships.

This monkey, who successfully saves the life of his unconscious friend, shows that it's not just well-trained pets that show compassion from each other.

The second monkey was electrocuted after running over train tracks in the Indian city of Kanpur, and his friend successfully resuscitated him after a good deal of shaking and a dip in drain water, all while an astounded crowd looked on from the platform.