Size is one of the easiest things to change in evolution; animals are always trying to be bigger than their fellows anyway, so once the ecological restrictions are off.... Vooom!
(it works the other way around too, the dwarf elephants of the Mediterranean islands got small very quickly after the rising waters cut them off from their parent populations in Afro-Eurasia)
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(it works the other way around too, the dwarf elephants of the Mediterranean islands got small very quickly after the rising waters cut them off from their parent populations in Afro-Eurasia)