SarathW wrote: Hi Santa
I see your point. What I am looking for is whether there are any characteristics which find only in human.
Why did Buddha say that human life is so rare and important?
There're quite a few things as already mentioned in the other posts. One obvious one is that our level of intelligence is quite unique. We're the only species so far on earth that can build spaceships and put men on the moon and at the same time build nuclear weapons that can destroy everything.
Your second question has 2 parts: rarity and importance of human life. Rarity because it's a matter of probability: the odds of being born human is 1 divided by the sum of all species within the animal realm (~ 8.7 millions and growing) plus all classes of beings in the hell, hungry ghosts, asuras, and deva realms. Needless to say, that's a very very tiny number. Importance because humans have about the right mix of suffering and blessing. Too much blessing like the devas and you won't have any need to practice the Dhamma. Too much suffering and you won't have any energy left for the Dhamma..