Most species are zombies. Bugs or bees for example. The fact they are such reliable zombies makes the fruit fly or nematode compelling model systems for researc

Most species are zombies. Bugs or bees for example. The fact they are such reliable zombies makes the fruit fly or nematode compelling model systems for research. Intelligence is costly but the fitness gains could be enormous. For example, no other apes have colonized the world as we have. At the same time intelligence is no guarantee of success as we’ve seen. Our extinct hominid cousins are evidence for this. They were intelligent and it did not seem to make a difference in their species success.