Is sky burial ritual inhumane and if not what is the reason for doing it? When it seems inhumane, why is it practiced?  

I know Buddha didn't find.  

Wikipedia document says:


  Sky burial (Tibetan: བྱ་གཏོར་, Wylie: bya   gtor, lit. "bird-scattered" is a funeral practice in.  which a human corpse is placed on a.   mountaintop to decompose while exposed to.  the elements or to be eaten by scavenging.  animals, especially carrion birds.  


So are people still doing this kind of funeral practice?
And what is meaning of it?

Though the body is decomposed and exposed to the elements, this isn't seem a respectful way to do.
Upasaka Swapnil, interested,

It's a still practiced way in the high cold mountains, with also practical aspects, since such as fire-wood for burning is raw and soil might be frozen. Next to that it serves good for Asubha-meditation for yogies and monks.

Nothing generally wrong with such and not inhuman but not beloved by those attached to body as the Self and Subha.

Good to watch for everyone to get more detached to rupa: Sky Burial: Tibetan Burial Ritual (video on YouTube)

(Note that it has not been given for trade, exchange, stacks or entertainment but to use it skillful as means out of this wheel)