Thanks to Sao’s post I did some reading up on the wild haggis. The following is interesting and if anyone wants to know more, it is an extract from their page on Wikipedia:
According to some sources, the wild haggis's left and right legs are of different lengths (cf. Sidehill gouger or Dahu), allowing it to run quickly around the steep mountains and hillsides which make up its natural habitat, but only in one direction.[2][3] It is further claimed that there are two varieties of haggis, one with longer left legs and the other with longer right legs. The former variety can run clockwise around a mountain (as seen from above) while the latter can run anticlockwise.[5] The two varieties coexist peacefully but are unable to interbreed in the wild because in order for the male of one variety to mate with a female of the other, he must turn to face in the same direction as his intended mate, causing him to lose his balance before he can mount her. As a result of this difficulty, differences in leg length among the haggis population are accentuated.[3]