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In order to truly understand differences among animal lifespans, we need to stop thinking about a specific number and start thinking about a distribution.
Check out the MinuteLabs interactive here: https://labs.minutelabs.io/survival-curves/
To learn more about this topic, start your googling with these keywords:
Life Expectancy At Birth: The average number of years a newborn in a particular group could expect to live.
Life Expectancy After Babyhood: The average number of years a member of a particular group could expect to live given that they had survived their first year.
Maximum Life Expectancy: The age at which the oldest known member of a particular group died.
Mortality Rate: The frequency of occurrence of death within a particular group during a particular time period.
Life Table: A table that shows the number of individuals within a group that survive from one year to the next until they are all dead.
Survivorship Curve: A plot of the data in a particular life table that shows the years on the x-axis and the number or percent of survivors on the y-axis.
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Ortiz-Ospina, E. (2017). “Life Expectancy” – What does this actually mean?. Our World In Data. Retrieved from: https://ourworldindata.org/life-expectancy-how-is-it-calculated-and-how-should-it-be-interpreted.
Brown JS, Cunningham JJ, Gatenby RA. 2015 The multiple facets of Peto’s paradox: a life-history model for the evolution of cancer suppression. Phil. Trans. R. Soc. B 370: 20140221. Retrieved from: http://dx.doi.org/10.1098/rstb.2014.0221
Barbieri, M. (2021). Personal Communication. UC Berkeley Department of Demography. Retrieved from: https://www.site.demog.berkeley.edu/barbieri-profile-page
United Nations. 2019 Revision of World Population Prospects. Retrieved from: https://population.un.org/wpp/
Khan Academy. Life Tables, Survivorship Curves, and Age-Sex Structure. Retrieved from: https://www.khanacademy.org/science/biology/ecology/population-ecology/a/life-tables-survivorship-age-sex-structure
Deevey, E. (1934). Life Tables for Natural Populations of Animals. The Quarterly Review of Biology. 22(4): 283-314. Retrieved from: https://www.journals.uchicago.edu/doi/pdf/10.1086/395888