The main star at a museum in Geneva, a two-headed tortoise named Janus, will celebrate is celebrating its 20th birthday.

Both of Janus’ heads live separate lives, according to a caregiver, who says one has a dominant character, while the other is more sedate.

The heads’ attempts to steal food from one another never fail to draw a crowd of visitors.

The tortoise likely would not have survived so long in the wild due to its anomaly.

But at the Natural History Museum of Geneva, the visitor favourite enjoys special pampering, including daily baths and time under UV lights, which ensure that its shell remains strong.

Janus, named after the Roman god often depicted with two faces, hatched at an incubator in the museum in 1997.