[big bad easter bunny]

http://www.sciencenews.org/articles/20050212/bob9.asp

[furball4paws]

Thanks bunny. I must have mistyped it in the original post.

[lepton]

For example, large animals generally have longer life spans than small animals, but small dogs live longer than large ones.

One reason may be that dogs are the same species, and what you have are faults off a form. The correlation between size and age does seem to hold up well for species. it seems to be somewhat inverted within species...probably due to things like heart problems, and structural breakdowns.

The really big exception is human life-span. As I recall, we should only live to be about 40, based on our size.