What about shrimp? Their brains turn out to have memory and learning centers, which has triggered an evolution squabble.
From sea turtles to the family dog, animals travel unerringly over long distances using geophysical cues. And it all evolved, independently, by chance! Believe that?
Scientists debate whether ctenophores are the earliest animals to appear in the Cambrian explosion. If so, they arrived with multiple tissues, a nervous system, and a digestive system.
Was there ever a more incongruous animal to imagine being a swimming champion?