In reply to JonC:
There are Yeti and in fact they are distantly related to modern man.
There is a current theory which came about because of certain ndescrepancies in the evolution theory - mainly how come it went neanderthal, five minute break .....MODERN MAN? I use the word Neanderthal to describe man, not yet aware of tools, seperate dwellings (ie houses and not caves), the use of fire etc etc etc.
It is now becoming more widely accepted than in fact two parallel races existed alongside each other for part of man's history on earth. One, your common or garden neanderthal, the other a more highly evolved (but still relatively basic by today's standards) race who were capable of tool making, use of fire etc and most importantly had a language. Instead of passing down lessons via crude pictures or having to demonstrate each 'skill' to another, this new race was able to 'spread the word' by actual speech! A powerful tool in those days.
As this more evolved race spread throughout the globe, through natural selection and inter breeding neanderthal man was out bred and basically made extinct..apart from a few living in the more remote and inhospitable regions of the planet. They too, over the millenia have evolved to a certain extent, for example to cope with each regions needs (Yeti/abominable snowman developed light colored fur as artic hares do for camoflage) but are basically what we term today as Yeti, Sasquatch, Bigfoot etc are the last in the line of these long distant cousins of ours.