The proto-coluans were not the apex preditors of their ecosystem they were lil herbivore monkeys who had be clever to not get eaten and they slowly used their smarts and tools to hunt all the big scary apex preditors on their planet to extinction and domesticated a bunch of rodents in the process. And some of their fellow monkeys
querl's tail was cropped at birth like normal but then he gets badly hurt during a mission and triggers his dormant gryxian regenerative abilities via chemical reaction and it grows back