to Friday, 17-Jun-2016 08:58:42 BST
This shows the percentage of rats still living at a certain age.
It is very hard to compare like with like in this group. Shelter rats and rehomed rats are often homed at an older age than others, and with an estimated age, which will skew the data.
Contrary to some claims, dumbo rats do not have significantly longer lifespans than top eared rats.
The exceptionally long-lived rats are obviously not yetincluded in the figures for recent years.