The Cambridge Animal Alphabet series celebrates Cambridge's connections with animals through literature, art, science and society. Here, H is for Horse – 170-year-old model teeth, the Parthenon friezes, and the surprising origins of racehorses' speed. - See more at: http://www.cam.ac.uk/research/features/h-is-for-horse#sthash.N0Nsuovs.dpuf