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1 1 | number.~Next, why are man and bird bipeds, but fish footless;
2 1 |  footless; and why do man and bird, though both bipeds, have
3 1 |    bends his legs convexly, a bird has his bent concavely;
4 11|      it were not so large the bird could not be a biped. As
5 11|   these considerations that a bird cannot possibly be erect
6 15|     if the wings be cut off a bird can neither stand still
7 15|       go forwards.~Again, the bird though a biped is not erect,