At the The Institute of Greatly Endangered and Rare Species in South Carolina, 5 year old chimpanzee Anjana took up the task of helping to hand-raise an orphaned cub named Sierra. The results were expectedly adorable! (Images via the Daily Mail).
In 2006, a photographer in India snapped this photo of a mouse perched on the back of a frog as floodwaters rose. The annual summer monsoon rains arrived early that year, but this lucky little mouse managed to keep its head above water, thanks to a froggy friendship. Check out more unlikely animal friends!