See what a "bamboo cake" looks like for a giant panda cub's birthday.

See what a "bamboo cake" looks like for a giant panda cub's birthday.

Xiao Liwu is living his best life at the San Diego Zoo. Just in time for his birthday, here's a look back at some of his most memorable moments.

Look back as Vila, who was one of the oldest gorillas, celebrates turning 58 in style.

It's panda birthday week at the San Diego Zoo.

Did you know pandas can eat 20 pounds of bamboo a day?

It may not be graceful, but it certainly is cute. Also, see how zookeepers choose a name for the baby elephant.

See why he's so popular with the ladies.

It's not a birthday cake you would probably like, but to each their own!

Winston is believed to be the oldest breeding western lowlands gorilla in zoos today.

It's a flavor of birthday cake that only a cheetah could get excited about.

Zookeepers made one big change to her birthday cake this year.

See how they celebrate a gorilla's birthday at the San Diego Zoo.

It's panda birthday week at the San Diego Zoo.

It's probably not a cake you would enjoy, but Bai Yun can't get enough.

Also: zookeepers manage to get an ultrasound on a pregnant panda, and celebrate a panda's third birthday.

When a bear really likes something, they'll partake of it in the customary fashion, i.e. rubbing it all over their head.

See his story from birth to present, and learn the meaning behind his name.

It's kind of a big to-do.

It may not be graceful, but it certainly is cute. Also, see how zookeepers choose a name for the baby elephant.

Meet Winston, the oldest breeding western lowland gorilla in zoos today.

Learn what goes into the process of a unique form of enrichment at the San Diego Zoo and what makes this cake special.

Talk about cute! Check out curious little gorilla Monroe getting into all kinds of mischief.

Meet Xiao Liwu, a giant panda born at the San Diego Zoo.