A Lifeboat to London for Darwin’s Frogs

The folk song “Frog Went a-Courtin’” recounts the efforts of a sword- and pistol-toting frog to woo a mouse, who warns him that without the consent of her Uncle Rat she “wouldn’t marry the president.” The courtship rituals of Darwin’s frogs, in the cool, temperate rainforests of southern South America, are not nearly as conditional. What sets their hookups apart are the child custody arrangements.Darwin’s frogs,…