Twin orangutans Towan and Chinta seemed to have ball celebrating their 40th birthday. Nice weather brought out hundreds of people to the zoo to help in the event. While the orangutans received wrapped gifts filled with treats and "orang cupcakes", visitors received tasty cupcakes from Cupcake Royale. Zookeepers shared stories about the orangutans, reminiscing about their antics over the past four decades.
In this photo, male orangutan Towan tore up a gift-wrapped package to discover his treats inside. (Photo by Dennis Dow)