How the Snake Lost Its Legs the butterfly, the snake, and the cheetah. Each consists of three to eight sections named in the style of Rudyard Kipling's "Just So Stories", with titles like "How the butterfly got its spots" or "How the snake elongated its body", though a couple of sections use "Why?" rather than "How?", as in "Why the fly twirls his penis" (it rotates during embryonic development under the control of different genes). In these chapters, Held explains the mechanics of evolutionary developmental biology, complete with accounts of what genes such as hox, hedgehog, and engrailed do to shape bodies. The third part is
How the Riddler Got His Name 18-49 demographics. With this rating, "Gotham" ranked first for FOX, beating "APB", fourth on its timeslot and fourth for the night behind a rerun of "The Big Bang Theory", "Dancing with the Stars", and "The Voice". The episode was the 59th most watched for the week in terms of viewership. "Heroes Rise: How the Riddler Got His Name" received mostly positive reviews from critics. The episode received a rating of 88% with an average score of 8.67 out of 10 on the review aggregator Rotten Tomatoes. Matt Fowler of IGN gave the episode a "great" 8.0 out of 10 and