The mother 3-toed sloth climbed down from the tree she was in after hearing her baby's call Kelli Bender is the Pets Editor at PEOPLE ... Good Samaritan found the little animal alone.

They actually saw a sloth ... little boy or girl, but for now, we’re focused on making sure both mom and baby are thriving,” zookeeper Erzar explained. Sago, Ziggy and the baby will continue ...

Once the mom is close enough to the human, she extends her arm, carefully grabs her child, and attaches the little sloth to her body. "It melts our hearts every time we can witness the reunion of ...