Do they drink through a straw? That's a better guess, if you think about what you see swallowing up humans in that film then it might get you closer (actually that clue might just confuse you more).

I might continue to alter the riddle to make it easier, I did just make it up...

You might have to think a bit metaphorical then. Its no worse than that Seagull Soup riddle!

UFOs?

A vacuum cleaner of some sort? Or maybe some kind of filter thingy?

A car?

That makes sense.

I'll give you a chemistry based clue here then. Living organisms take food to allow them to create energy with which to perform their vital functions. This energy is produced through a process in which an organic compound (the food) reacts with oxygen to produce carbon dioxide, water and a few other waste products. In this case, the food is something that is ingested to allow this same energy production to occur.

I never said that it eats anything though.

Got it. Right Track gets the points. Now post us a riddle.

Haha. That's brilliant.

I have keys that open no locks,
I have space, but you cannot fill it,
You can enter, but you cannot leave.
What am I?

No cheating...

A computer keyboard?

But what about the caps-lock key...? That opens and closes a lock!

Yep. :(

*mumbles*