When hurricane Hannah separated two ultra-prosh white tigers from their mother, Anjana came to the ResQte. Anjana, a chimp at TIGERS in South Carolina, became surrogate mom and playmate to the cubs, even helping with bottle feeding, according to The Sun (and don't miss the slideshow). But here's the truly amazing part: Anjana does this all the time, having raised leopard and lion cubs.
Found via various sites. You young'uns may appreciate this explanation of the hovertext.