Answer:
I'm not a bird, but I can fly through the sky. I'm not a river, but I'm full of water. What am I?
I am a word. I become longer when the third letter is removed. What am I?
I have cities but no houses I have mountains but no trees I have water but no fish. What am I?
No legs have I to dance, no lungs have I to breathe. No life have I to live or die, and yet I do all three. What am I?
My first half means container. Not a lot of people understand my language. What am I?
What language does a billboard speak?