The evolutionary routes are many, she knew, wending through the howling wilderness of the maladaptive, on to their severely narrowed destinations. Biology abounded with convergent examples, destinations arrived at along very different paths. Fruiting bodies of slime molds and myxobacteria alike evolved multicelled advances. Warmbloodedness came forth several times, as did live birth and even penile tumescence. The eyes did indeed have it-as seen in the camera-like eyes of vertebrates and octopi, and the similar tiny preceptors of worms and jellyfish. Nature invented over and over again the mechanisms used by diverse organisms to hear, smell, echolocate, sense the prickle of electric and magnetic fields.