How a Philadelphia Zoo gorilla celebrates turning 31

Motuba, a Western lowland gorilla at the Philadelphia Zoo, opens a present the staff put out for him to celebrate his 31st birthday.

For many humans, any birthday past 30 is no cause for celebration.

But at the Philadelphia Zoo, there was plenty of celebrating to mark Motuba's 31st.

The Western lowland gorilla turned 31 on Saturday and zoo staffers held a celebration Thursday, complete with song, presents and giant, colorful cakes and cupcakes made from his favorite treats. (The celebration was pushed back due to the weekend snowstorm.)

Motuba, who was born at the Columbus Zoo and Aquarium and arrived in Philadelphia from Omaha, Neb.''s Henry Doorly Zoo in Feburary 2014, is part of the zoo's popular gorilla exhibit.

In zoos, gorillas can live as long as 50 years, but a typical lifespan is around 34 years, officials said.

The zoo says its gorillas eat primate chow, fruits and vegetables, and other snacks like puffed cereal, popcorns, raisins and seeds.

The Western lowland gorilla is listed as a critically endangered species. The Philadelphia Zoo has four other gorillas; Motuba is the group's most recent addition.