To answer both of your questions, yes and yes. Just because the weapons are only for non-human hands doesn't mean it can only shoot non-human targets. An example of a prawn (or an almost-prawn) using a weapon against a human is when Wikus shoots the drug lord (sorry to give away a little bit of a spoiler).
they just wanted to get back home! i thought that was a horrible movie!
Battle for Terra
"Planet 51" (2009). Animated.
A type of saliva. It is the same stuff that mixes with the resin to cocoon humans.
That was the 2009 film , title District 9
A movie just came out called "District 9", where aliens are confined to a shanty town in Johannesberg. Its their own shanty, so not sure if that's the one. Weta did effects (of LOTR fame)
it might be Earth girls are easy
The Arrival and District 9 both feature aliens whose knees bend backwards, but in real life, camelids fron knees bend forward, and rear knees bend backwards
Aliens
"Aliens" , but this is a matter of opinion .
Cowboys & Aliens
No, Aliens are not involved in this movie Did you see this movie? Of course aliens are involved in this movie . . . I don't want to throw the end, But yes aliens appear complete with space ship!