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
Javan leopard leopard "Panthera pardus spelaea" Javan leopard The Javan leopard ("Panthera pardus melas") is a leopard subspecies confined to the Indonesian island of Java and has been listed as Critically Endangered on the IUCN Red List since 2008. The population is estimated at less than 250 mature individuals, with a decreasing population trend. The total remaining habitat is estimated at only . In Indonesian, it is called "macan tutul jawa" and "macan kumbang". The Javan leopard was initially described as being black with dark black spots and silver-grey eyes. Javan leopards have either a normal spotted coat, or a recessive phenotype