A mama for Owen by Marion Dane Bauer ; illustrated by John Butler

Owen & Mzee: the language of friendship by told by Isabella Hatkoff, Craig Hatkoff, and Paula Kuhumbu ; with photographs by Peter Greste

Owen and Mzee: the true story of a remarkable friendship by told by Isabella Hatkoff, Craig Hatkoff, and Paula Kahumbu ; photographs by Peter Greste

Tarra & Bella: the elephant and dog who became best friends by text and photography by Carol Buckley

Friends by written by Catherine Thimmesh

The monkey and the dove: and four other true stories of animal friendships by Jennifer S. Holland