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Well, their immune system superiority is mitigated by the environment they normally live in, plus there’s obviously a lot more to life expectancy than just not getting sick. As far as I understand, rats and cockroaches as species do outlive many others mainly due to their “reproduction volumes” — they give birth to some crazy numbers of babies and do it very frequently.
I’m no expert in biology by the way, just thinking out loud.
rats cockroaches and migrants
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