very obvious first look at your head it will look very odd shaped, secondly your hands and feet are much longer than you think, you can think of more things, your eyes are widened and bigger, your skin in much pale than other pale people.
I can tell that is an alien space ship.
if it is not breathing
Poke it
ask it ?
Tell about cultures,customs,and beliefs
Ask her to tell you all about it.
If it has a face then you probably can
If you DID have an alien and you wanted to hide it, tell it to make himself invisible with magical powers or something.
The human race has not yet seen an Alien and still do not know if they exist, so nobody knows if they have genders and if they do we do not know how to tell one from the other.
If your Alien is blue , green ,black or gold it's a boy . If your Alien is pink ,white ,red or silver it's a girl.
If it isn't breathingHow to tell if its breathing: if the egg steams up then its breathing if not the alien is dead.
Why you probably know because ur an alien ALIEN I tell u