I don't get the idea of saddle's you can ride a pig (AWESOME)(soon to be dragons) but i don't see the point as you have to get it from a spawn point, but why can't you actually make one, please leave comments.Also according to the word of Notch it has been proved that in the next big update there will be dragons when you can fly them, Rail
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well, thats what i hope
Free
If you want some, either invedit them in (hacking), or find some dungeons (legit).
Personally, I think they're useless and incredibly stupid.