Other Theories About Harriet
An initial analysis of Harriet's DNA was unable to identify her subspecies in a cross section of 900 animals representing 26 extant and extinct populations. After reanalysis she was assigned to G. n. porteri. However, her genetic diversity and other factors in her DNA sequence data indicated she was most likely at least two generations removed from the oldest specimens of her subspecies in the dataset. The oldest G. n. porteri in the dataset were collected as adults in 1907 and, hence, this would require Harriet to be born by 1860.
This dating rules out many alternate possibilities for Harriet as, prior to 1900, Australia was a very difficult place to get to. There were only two imports of Galápagos tortoises prior to 1900, and four of the five animals involved have been accounted for and are still represented by museum material. The suggestion in some quarters that Harriet was collected by whalers and brought to Australia is not likely, as Australia had its own whaling industry and whaling ships from South America did not visit Australia.
The tortoises collected by Darwin were all recorded in Fitzroy's journals of the voyage, including their measurements. As they averaged 11 inches (280 mm) in length, and this represented an approximate age of 5 years for the subspecies, Harriet's year of birth was estimated by Scott Thomson to 1830, with an error of 2 years either way, in the 1995 paper describing the events of Harriet's life and the results of the research.
Some also believe that Harriet was left with the Yabsley family of Coraki who were also on the Beagle.
Read more about this topic: Harriet (tortoise)
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