we saw it about 10 years ago, so the title escapes us.
It was a movie of a battle between a huge ugly male race, and these small females of a race on the other side.
i remember the males was trying to in pregnant the female race, and killing them in the process.
And i THINK the females attacks, defenses and such was all nature based. like a wall of thorns that grew instantly from seeds dropped from a mounted female warrior.
My wife seems to remember they DID succeed in making one of the females pregnant. and in the end of the movie, the child was one of the only ones left on the planet...we could be wrong.
its been bugging us on and off for years, when we happen to bring it up remembering the name.
