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exception to body size/reproductive capacity etc. argument

The relationship between small body size and fast turnover of
generations doesn't always hold.  Bats are the second-largest group of
mammals (in terms of species), and most are very small, but they
reproduce slowly (very few species normally produce more than 2 young
per year, many produce only one).  There is at least one record of a
microbat in North America reaching the age of 30 years: not something
one would expect in, say, a rodent of the same size.  So yes, small
creatures often live faster, but not always.  Also remember parrots:
they aren't all that big, but some live longer than humans.  So I
don't think it's safe to try to generalize on the subject.