The chimp is just 2 years old, and his keeper thinks he was happy to have someone near his own age to play with: the next-youngest chimp is his 15-year-old sister.
At one point the mother took the baby away from the window.
"I felt that it was necessary for us to leave so the other kids can actually interact, and when we did, unfortunately the little monkey did get depressed so everybody was like, 'Come back over!'" said Cindy Little, the baby's mother.
So she brought the baby back and he and the chimp played some more.