I wonder, especially since they are finding these bones
on an island, if this phenomenon is related to a similar
case of 'shrinking mammoths' found in the fossil record.
In the case of the mammoths, they were found to have shrunk
in size fairly rapidly (considering evolution) due to a limited
amount of food supply (I believe also on a cut off island or something).
Which doesn't suggest a very happy ending to 'the hobbits' of Flores
Island if true.

They should test the bone marrow of that little bone they found for
vitamin and other deficiencies...

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