The definition of the abominable snowman (yeti): A hairy humanlike animal reportedly inhabiting the snows of the high Himalaya Mountains. Also called Yeti.
As mythology has it, the abominable snowman does exist, though no one can prove it actually does. This can connect to Tibia in many ways. First off, since it hasn't spawned in some worlds, and has a limited spawn, maybe there's a catch, as to the myth in real life. Tibians can say they killed one, or they got killed by one ... but when other people actually start looking, they can't find it. Seeing a Yeti may be a person's dream, whether it's real life, or Tibia for that matter. Now ... whether they're hard to kill or not, that's for you to decide. When they're dead, as you can see ... they're in a huge pool of blood.
Looking at the Kill Statistics from Calmera and Secura ...
Calmera: a yeti 17 3 17 3
Secura: a yeti 0 0 2 0
Much more people died in Calmera than Secura, but more yetis were also killed. You can take a look at other worlds, such as Antica, and Lunara for example, and you will not see a yeti on the charts ... yet. The way I think of it, yetis will be seen throughout the whole Tibian world in a matter of time. Though, stop spawning as they did in Calmera so people can't see them. So ... where will the yeti be next? How will it spawn? When will it spawn? Where will it spawn? That's for you to find out. :)