2 Answers

Do larger birds live longer than smaller birds?

Generally, large birds and seabirds live longer than small birds. Albatrosses live so long that it is hard to calculate their survival rates - they can live longer than the metal rings that identify them, and probably longer than most humans.

Even little seabirds like Storm Petrels live a remarkably long time - about seven years on average for adults - and they take about four or five years to reach adulthood.

But there is a very big difference between the average life expectancy and the maximum one and the maximum known age for a Storm Petrel is over 31 years! And the oldest known Robin was 8½ years old. Even very small birds can live a remarkably long time; for instance, the oldest Marsh Tit was more than 10 years old and there has been a 21 year old Blue Tit! These are species for whom the average life expectancy is only just more than one year, so you can see how very much better than average these particular individuals are. Their contribution to the subsequent generations is ten or twenty times as much as the average individual’s so it’s easy to see how natural selection could work.

Read more :    http://www.countrysideinfo.co.uk/bird_lifespan.htm  

It is more complicated than size- but considering small dogs live longer than big dogs a fair Q