We know that the Cats were Mumm-Ra’s most favored species, being his top enforcers, but where exactly do the other races stand? I believe each race performed specialized tasks, and there was a sort of cast system Mumm-Ra had in place. Here’s how I think Mumm-Ra viewed his servants;
Cats
Birds
Dogs
Monkeys
Lizards
Elephants
Sharks
Rats
Cats: already established as being Mumm-Ra’s elite, working as enforcers who helped control the rest of the animals. The cats acted as leaders both on and off the field, making sure the other animals did their jobs. The tigers may have been Mumm-Ra’s favorites since they stayed loyal, with lions a close second.
Birds: So far have been shown to be the most intellectual. They were always probably very good with technology, and may have been engineers in addition to Mumm-Ra’s air force.
Dogs: Here’s where things get a little more vague. The dogs and jackals probably served as scouts and intel gathering, aside from being
Monkeys: Guerilla tactics (pun not intended), possibly used as commandos who could more easily traverse heavily wooded jungle areas.
Lizards: Mumm-Ra’s grunts, and now we’re getting to the low end of the system. In “Birth of the Blades” it sounded like Mumm-Ra used them for cannon fodder and overall were the first infantry thrown onto the front lines.
Elephants: Heavy lifting and manual labor. Their present attitude is very pacifist, and that may have been intentional; Mumm-Ra wouldn’t want anything that big and strong to get too angry, so just kept around the more docile ones when he needed extra muscle.
Sharks: Used for aquatic missions. Since their purpose for Mumm-Ra would be in special circumstances, they probably weren’t seen as being very useful overall.
Rats: the lowest of the low, rats were little more than janitors to Mumm-Ra. They didn’t even get uniforms, forced to be naked. This view persisted even after the crash, and they were persecuted not just by the cats but many of the other races as well. They may have been miners as well, and worked alongside the elephants.
Now, here’s how I think the relations between the races are at present;
Cats (formerly anyway)
Birds
Elephants, Sharks
Dogs, Monkeys, Lizards
Rats
After the fall of Thundera the Cats have been knocked down a few pegs. I’d say they’re more around the level of the Elephants and Sharks now. We have yet to see what the Shark and Monkey societies are like, but I can make some assumptions.
The top four races each hold a stone of power. The Elephants and Sharks don’t seem to have much interaction with the rest of the world, so they don’t really fall into this hierarchy, but the Elephants have been shown to be pretty stable and civilized, and I’m guessing the Sharks are too if they were trusted to hang onto a stone.
Dogs, Lizards, and Monkeys seem more barbaric. I only have Addicus to use as an example for Monkeys, and he’s a complete monster, but his clothing doesn’t suggest a society that’s as advanced as the others. It could turn out that the Monkeys are very civilized though, once we see them.
We’ve seen that dogs have formed their own societies that are almost as advanced as the cats, with laws and rules, likely helped by their strong pack mentality. Lizards are harder to define. We know that they’re able to form their own armies, so they must have some kind of society of their own, but it’s likely not very stable if a warlord like Slithe could take control. They were fairly primitive, until Mumm-Ra woke up.
And last, the rats. Having been Mumm-Ra’s least favored made them the most persecuted by the other races. They lacked power and were probably little more than cavemen until Ratilla found the Sword of Plundarr. He was able to lead the rats to power and they likely would have advanced much further until Jaga put a stop to them. They’re not as primitive s they once were, but Ratar-O and the rest of them are just riding on Ratilla’s former success. It seems the one thing the rats have going right now is their mine on Mount Plundarr, which the Crew of Omens said has Thundrillium, or Thundranium. Some valuable material anyway.