system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Are some species more likely than other to yield Jedi? And a few other questions.

Actually I have a few questions about speciation in Star Wars. Obviously we see a lot of human characters in the movies because they're easier to depict. But in-universe are humans actually the dominant species in the Galaxy? Is that why most Jedi we see are human, or is there a race that are more "Jedi Potent"? Could any species potentially produce Jedi? What about less developed species such as the ewoks, or animal species such as cows?
gpt
Human beings are the dominant species in the galaxy by a wide margin, though exactly how they achieved this is up for debate. One theory is that human adaptability and relatively short life span and relatively high reproductive rate provides them with both the means and motivation for expansion, another is that Humans or their ancestors acted as a servant species for a race like the Rakata and/or Celestials and were spread across the galaxy during the expansion of their ancient dominions. 

Humans being the dominant species in the galaxy means that other race's force sensitivity is generally judged against theirs. 

Some species are always force sensitive: The Miraluka, Neti, Jungle Felucians, Shards and Red Sith for instance. They're poorly represented in the Jedi and Sith orders due to either their relatively small population, limited contact with the rest of the galaxy, or in the case of the Red Sith, their apparent extinction.

Some species seem to have an equal or slightly better chance to be force sensitive than humans. Kel Dor, Zabrak, Twi'lek and Ithorians are probably the best known of these. While each of these species has expanded throughout the galaxy, they are not as numerous as Humans. Also, each of these species and many others like them have their own force traditions which some choose to honor instead of joining the Jedi or Sith order. 

Some species are much less likely to be force sensitive: Wookiees, Hutts, Toydarians and Gamoreans for instance. In the case of Hutts and Toydarians, this lack of force sensitivity has evolved alongside a resistance to some force techniques. Of these four species, there have only been recorded instances of Wookiees and Hutts among the Orders, most likely due to their relatively high populations.

There are some non-sapient force sensitive species, two of the most well known are the Ysalamir and Vornskr, natives to the Neti homeworld of Myrkyr. In an evolved predator/prey relationship the  Vornskr has developed the ability to use the force to sseek out it's prey, while the Ysalamir have developed the ability to negate the force in a small radius around themselves, hiding themselves from the Vornskr.