In 2004, Owen the hippo was found alone and dehydrated near the coast of Kenya, in Africa. He was brought to a wildlife sanctuary, where he met Mzee the tortoise. Watch the video above to learn what happened next. Read the April 27, 2012 issue of TIME FOR KIDS to learn more about animal friendships.

To learn more about Owen and Mzee, check out these books:
Owen & Mzee: Language Of Friendship by Isabella Hatkoff, Craig Hatkoff and Dr. Paula Kahumbu and Peter Greste
Owen and Mzee: The True Story of a Remarkable Friendship by Isabella Hatkoff, Craig Hatkoff and Dr. Paula Kahumbu

For videos and activities, visit owenandmazee.com.