I've done a paper on teh Samurai recently, and I believe that the yautja are actually quite similar to them:
The samurai have a code of honor, known as Bushido, where honor is valued above life. I'm not quite sure if Yautjas follow this to such an extreme, but honor is most defenitly important.
The samurai would decapitate their opponents head and keep them as trophies for proof of their kill *cough* just like teh yautja *cough* XD
Now, as seen in the movies, just before they were defeated the pred would set off the bomb, killing itself (and taking anyone else with them). when defeat was innevitable, the samurai performed Sepukku in which they basically disembowel themselves, however the comparison here is that they will kill themselves without the fear of death.
In avp the armor of the predators also were somewhat similar to that of the samurai, the preds were wearing what seemed to be an oyoroi(It's that metal skirt thing the samurai wear).
i just found this a bit interesting how similiar they are :3 they probably got ideas for the pred from the samarai, for me it makes them a little cooler XD
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