the.com/mule
the genetic dead-end that out-thinks, out-lasts, and out-stubborns every purebred parent it has
hybridhorse mother, donkey father, almost always sterile
smarterwon't panic-flee into danger like horses do
sure-footedhauls Grand Canyon tourists down sheer cliffs daily
long-livedoften works productively past age forty
hybrid vigorstronger and tougher than either parent species