Rats Can’t Throw Up. That’s Exactly Why They’re Winning.
Rodents can’t vomit β not mice, rats, squirrels, or beavers. This seemingly catastrophic biological gap should have doomed them. Instead, they became one of Earth’s most successful mammal groups by evolving radically different toxin strategies: eating clay, developing tolerance, and learning to avoid harmful foods. Their inability to purge is exactly why they dominate labs and pest control alike.