Scientists aren’t sure why identical twins differ. Armadillo quads offer an answer
One of the armadillo quadruplets runs away when she hears Amanda Withnell approaching; her three siblings calmly keep their faces in their food bowls. Another, seemingly unable to summon the bravado you’d think would be standard equipment on a little oval tank with feet, is a neurotic mess compared to his three mellow siblings, regularly running panicked into walls or jumping straight up like a jack-in-the-box — a patented armadillo move.
Withnell can keep track of which nine-banded armadillo quadruplet is the shy one or the neurotic one because the siblings often differ in appearance as much as they do in behavior. One has a touch of white on its left ear while the other three have it on the right; one has a symmetric blaze just above the nose while another’s blaze will tip left as if drunk.
