Earth's wobbles killed mammal species

View at Xinhua
: "Wobbles or variations in the Earth's orbit and tilt are associated with extinctions of rodent and mammalian species, Dutch scientists said on Wednesday in a study published in the journal Nature.

Dr. Jan van Dam from the Utrecht University and colleagues reached this conclusion after studying the fossil record of rodents from central Spain over a 22-million-year span, showing a link between rodent extinction events and the climate record.

'Extinctions in rodent species occur in pulses which are spaced by intervals controlled by astronomical variations and their effects on climate change,' said van Dam.

They found two cycles corresponding to the disappearance of rodent species. One lasts 2.4 million years and is linked to variations in the Earth's orbit. The other is a 1.2 million year cycle relating to shifts in the tilt on the Earth on its axis."

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