In the Alpha and Beta Quadrants we encounter many different alien races. Was it ever commented on which race had the highest population? We know both the Klingon and Romulan empires had fleets to match the Federation, comprised primarily of their respective races, while the Federation incorporates many different alien species.
Out of the alien races we know of, which is the most populous in these 2 quadrants?
Would like specifically looking for, what we could say as sentient lifeforms(klingons, humans, vulcans, ect).
But tribble or other answers welcome if you have accurate counts