If you consider to whole universe and all the living creatures in it as God's creation, then all should benefit of rights. 

The question of giving or not giving them rights will only arise if humans turn out to be more powerful than the aliens who come on earth. If it is other way round, aliens will decide whether to continue with human rights or not!

In case humans turn out to be more powerful, then the decision to give rights and how much, will vary upon their needs and desires etc. as living beings.

If they are just like humans and as evolved as humans of earth, then of course they will deserve all the same rights.

Elias, remember Sting's (I'm illegal alien)?

It actually came in the same time I started to feel I'm an illegal alien on earth, therefore aliens are my extended family(,") Despite everything I see in the movies about aliens and how they imagine them, I believe they're the coolest creatures and they need protection from humans! For me I can't call an alien (it), they're humans in different shapes. But again this is just me, so don't worry, this is not a theory or something;)

I did not say like animals. That will have to be determined after analysing them and their needs, desires, etc.

Everyone deserves to have rights and in the case of aliens, their rights must be called "Alien rights" and they should be for real, so humans won't have a chance to hurt them!;)