Nobody knows. Aliens probably have some liquid, water or not, that they need to survive. Whether they get thirsty for it we don't know because, of course, we are yet to discover extraterrestrial life.
I have never heard of aliens with fins.
Yes, have you ever played the game Aliens and Astronauts before?
No, people will Not be Aliens in 20 years or EVER
Aliens have never visited Saginaw.
As no aliens have ever been seen it is not known what colour they might be.
I am 99.89% sure that they were not aliens.[Nothing's ever 100%]
No.
The U.S. Government has already classified over 55 species of aliens.
Yes, as a member of the Immigrant Support Soceity I talk to aliens all the time.
No.
No.
If by 'aliens' you mean intelligent extra-terrestrial beings, there is no plausible evidence that any have ever visited Earth. However, with billions of planets in the universe, it would be arrogant of us to believe that we are alone, as the only intelligent life forms that ever evolved. There must be 'aliens' out there.