Kaminar

Kaminar was a ringed class M planet located in the Kaminar system. It was home to two sapient species – the warp-capable Ba'ul and the pre-warp Kelpiens. 

Unlike Earth, which had a food chain, the species map of this planet was binary, where a lifeform was either predator or prey.

History
In the first century of the 1st millennium BC, Kaminar was sparsely populated. The planet's population was divided into three groups: the Ba'ul, the pre-vahar'ai Kelpien, and the post-vahar'ai Kelpien. The post-vahar'ai Kelpien were the main predatory species on the planet, preying on the Ba'ul. Within eighty years, the pre-vahar'ai Kelpien had either evolved into being post-vahar'ai Kelpien or had died out. Starting in the first century AD, the Ba'aul were being driven to near extinction by the post-vahar'ai Kelpien. Then, there was a shift, wherein the Ba'ul population rebounded, with the post-vahar'ai Kelpien dying out.

At some point, there was a resurrection of the pre-vahar'ai Kelpien. This reborn species had the potential of becoming post-vahar'ai Kelpiens. Their numbers started to increase, yet they were always smaller in number than the Ba'ul. These events were recorded by the alien lifeform known to the Federation as the. Data from these recordings was later used in the creation of the Kaminar population history by the USS Discovery crew in 2257. 

By the 23rd century, the Ba'ul were a technologically advanced species who required the pre-warp Kelpiens to ritualistically sacrifice themselves to their ships. 

The planet's sky was dominated by several nearby bodies. Lifeforms on the planet included flying animals. Animal sounds could be heard constantly. The Kelpiens harvested a kelp-like aquatic plant, as well as flowers, including fredalias. 

Background information
Scenes on the planet for and  were filmed at  in Toronto.

Apocrypha
The Pocket DIS novel Desperate Hours calls Saru's homeworld "Kelpia". This was later contradicted by another Discovery novel entitled Fear Itself, which first established the planet's name as Kaminar months before the release of "The Brightest Star".