how long does a robin bird live
We can now answer the question, for Robins at least. So if the mortality is 0.6 (as it is for adult Robins) then the life expectancy is 1.2 years. In the case of our Robins, if the mortality is 0.6 then the survival is 0.4 (i.e. 1-0.6) and the life expectancy is 1.1 years.