www.telegraph.co.uk said:
Shrinking is a much faster process, however. Large-scale reductions in size leading to dwarfism only take around 100,000 generations.
Scientists writing in the journal Proceedings of the National Academy of Sciences looked at 28 groups of mammals, including elephants, primates and whales.
Size change since the age of the dinosaurs 70 million years ago was tracked by generations rather than years to account for varying life spans between species.
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