> Florida’s cane toads are believed to descend from escapees from an exotic-­animal importer at the Miami airport, where a hundred of them got away in 1955. I'

> Florida’s cane toads are believed to descend from escapees from an exotic-­animal importer at the Miami airport, where a hundred of them got away in 1955. I've heard repeatedly that the hazards of inbreeding make it nearly impossible for a species to recover if the population drops too low. There's a theory that the human population bottlenecked down to 20,000 or so individuals 70,000 years ago, and that we nearly went extinct as a result; the scars are still visible today, in the low genetic diversity of modern humans. So how does a breeding population of a mere 100 frogs remain a going concern dozens of generations later?