Lifespan, longevity, and ageing
Observations: There is a delayed implantation after fertilization (Ronald Nowak 2003). The actual embryonic development takes about 7 months, but the pregnancy usually lasts 1 year. In the wild, these animals have been estimated to live up to 22 years (http://www.demogr.mpg.de/longevityrecords). Their longevity in captivity has not been studied in detail and hence their maximum longevity could be underestimated.