Chordate of the three subdivisions of chordates, all have distinct skulls. They include the hagfish, which have no vertebrae. Michael J. Benton commented that "craniates are characterized by their heads, just as chordates, or possibly all deuterostomes, are by their tails". Most craniates are vertebrates, in which the notochord is replaced by the vertebral column. These consist of a series of bony or cartilaginous cylindrical vertebrae, generally with neural arches that protect the spinal cord, and with projections that link the vertebrae. However hagfish have incomplete braincases and no vertebrae, and are therefore not regarded as vertebrates, but as members of
Animals (The Goodies) bears for cruel taming. So, Bill and Graeme came up other ideas and put the animals to work in energy-saving domestic duties. Tim is horrified at what they have done, so he decides to support an "Animal Discrimination Act": Animals are granted equal rights with humans and it is now illegal for humans to exploit animals. This includes a ban on eating animals, which enrages carnivore Bill, who decides to "speak out" for vegetables in the "Rabid Frost Programme", where he ends up eating the leader of the Animal Revolutionary Party and make animals angry for seeing the true meaning