WASHINGTON - A woolly brown rhinoceros that weighed two tonnes once roamed northeastern Siberia before mysteriously disappearing around 14,000 years ago.A new study by a Swedish and Russian team of scientists who examined DNA fragments from the remains of 14 of these prehistoric mammals lets our species off the hook.
"That makes it more likely that climatic changes that happened around 14,000 years ago are the primary driver of extinction, rather than humans," Love Dalen, a geneticist at Sweden's Centre for Palaeogenetics, told Agence France-Presse.How did they reach that conclusion from DNA strands taken from the remains of animals frozen in the soil for thousands of years?
From other animals they were able to harvest mitochondrial genomes - which are passed down from the mother - and from this could estimate the size of the female populations over time.
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