Hippos, not primates, win. Beneath a dolphin's polished social performance--play, coordinated hunting, and whistles that can appear almost conversational--molecular phylogenetics places the animal inside Cetartiodactyla, the hoofed-mammal branch that also contains hippos. Looks mislead us. Rarely does conduct map cleanly onto descent.That result overturns an easy visual instinct. DNA sequence comp...More