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Rodent predators?

Mouse
in Evolution, Morphology and Exobiology

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Just a figment of my wild brain....

 

Is it possible for a rodent to change its teeth from this to this?

 

variants_large_3821.jpg to thylacoleo-carnifex-01.jpg

Rodents can be very nasty. See this for example:

http://www.guardian.co.uk/environment/2008/may/19/wildlife.endangeredspecies

 

And rats are even nastier, probably having caused the extinction of thousands of species after we carried them along on our ships to various islands.

 

I doubt their tooth structure will change to the one shown though, but they can be nasty enough as is.

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