Article on cat genetics and domestication
Or rather, the lack thereof, because a study had indicated that the cats that live with humans are still not very different from their wild cousins.
https://arstechnica.com/science/2017/06/cats-are-an-extreme-outlier-among-domestic-animals/
https://arstechnica.com/science/2017/06/cats-are-an-extreme-outlier-among-domestic-animals/
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re: cats
yes, I assume that yawns are partly to show off their very very sharp teeth. Though more subtle than a Russian fighter jet showing off its missiles to a NATO plane (which happened last week).