Radiocollars, which commonly are used to study mammals, might increase
the mortality of the animals studied. We used Cormack-Jolly-Seber mod
eling on data of root voles (Microtus oeconomus). to rest whether an i
ncrease in mortality due to radiocollars occurred, Higher mortality wa
s not detected in animals wearing collars compared with animals that d
id not wear collars.