In Rajasthan, India, Hanuman langurs groom a feral dog. Primates use grooming to form social bonds, and langurs often extend the courtesy to other species. Though they're sacred in India, Hanumans (named after a Hindu god) are decreasing in number because of habitat loss. | Cyril Ruoso/JH Editorial/MINDEN PICTURES
"You become responsible, forever, for what you have tamed."
— Antoine de Saint-Exupery, The Little Prince