Why is the galaxy dominated by humans

Back in the days of the EU I read an explanation that the Rakata would frequently use humans as slaves, taking humans with them whenever they conquered a new planet. The humans would eventually outlive their masters and become the dominant species of the galaxy.

I am wondering what the new canon has to say about this. Unfortunately I can't keep up with all the information that the story group is churning out on a daily basis and the information that I found concerning my question is either contradictory or outdated. To me it seems quite weird that humans became the dominant species of the universe. They are neither incredibly strong nor fast nor technologically advanced in comparison with other alien species. They don't reproduce faster or live longer than many other species in the galaxy.

Is there any canon explanation why humans seem to make up ~90% of all sentient beings in the galaxy?

 

I don't think so. We see Mon Cala do just fine on their ships and Yavin 4 so we can assume that they don't have issues with the environments humans live in. They don't need rebreathers or anything like that. However they do have an advantage since they can inhabit land AND water. They should be more successful than humans since they can use all the space availeable on planets like Kamino, Anch-To and Naboo.

 

Why don

Hydrogen is the most common element in the universe. The Mon Cala can easily live in multiple different environments including planets covered in water which humans can not. On our own planet we can only use less than 30% of the planets surface, the Mon Cala could use all of it. There are many episodes of the Clone Wars and Rebels where we see them living on all kinds of planets without any problems. Same goes for Quarren and Nautolans. Unkar Plutt, a Crolute and thus a member of an aquatic species even lives on the desert planet Jakku. So clearly aquatic species have an advantage. And yes you don't see alligators in the desert but you neither see them in space. Unlike the Mon Cala

 

1) You just stated what I said above. I know that they inhabity most planets but why are they so succesful?

2) CGI and animatronics don't require makeup at all... But I get what you are saying and I am aware of the real reason why so many humans are present on set. I wanted a Canon explanation though and not a "making of" explanation.

 

As far as I know in the EU the Rakata were the first to master interstellar travel. The Hutts were some of the early explorers too which is why they became so powerful. But in the new Canon there's no mention who invented spacetravel, only that the hyperdrive was inspired by the purgills.