Perth Zoo's southern white rhino Memphis celebrated his 30th birthday on Monday with his keepers, a special cake and a rousing Happy Birthday chorus.

Memphis, who tips the scales at two tonnes, enjoyed extra celery and a cake made from ice, fruit, and carrot.

Memphis celebrated with an ice cake. Credit:Kira Carlin

Zookeeper Luke Newing has worked with Memphis for seven years and said he was an important ambassador for his species.

"He's a key animal to have at Perth Zoo, but he's also representing his species; these guys are listed as conservation dependent, their numbers are declining, so its important to spread the message," he said.