"Willem Van der Voort" schreef in
bericht ...
In the wild, they survive for 2 years on average; most do not survive a
second winter. In captivity, they normally start to deteriorate in
condition as they approach their third year becoming thinner and losing
much of their fur, nearly all die during their third winter.

http://en.wikipedia.org/wiki/European_Water_Vole
Greets, Willem

What about the De muskusrat of bisamrat (Ondatra zibethicus) Willem?
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Greetings
Bouler (The Netherlands)