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Do we know that? Why not bears? And do we know if attacks on humans were common?

One factor against bears being #1: Bears are not obligate carnivores, i.e. they can survive on fruits and vegetables. Cats cannot.

Because of skulls with jaguar-like teeth marks.

If you have a link, it'd be interesting to read. I websearched a bit but found only current time articles about jaguars

We have so few bones and skulls from back then that it is impossible to conclude anything.