Also check out:

https://youtu.be/iIpxyNZwB-U

First, they eat WOOD! It's literal tree armour made out of dead cells and they just chow down on it with teeth that NEVER stop growing and are reinforced with f'cking iron! The same thing we use for dominant species things like pipes and tools and stuff.

You have one of the most intelligent animals in the world, with fragmented, bendable and partially collapsible bones to squeeze into creepily small holes. They also have some of the smallest, most undeveloped, yet so human-like and problem-solving brains in the animal kingdom. (rats);

Next, an animal which is smart enough to use surrounding trees as a food source, shelter AND storage at the same time! Yet somehow dumb enough to forget its food hiding spots, thus solving deforestation in the process! (squirrels);

Then, you have razor sharp teeth, one of the most muscular animals relative to their size and swim goggles for eyelids. Born with a degree in civil engineering and the instinct to use it by chopping down the most durable of life forms with their BARE TEETH! Building infallible dams to hold water, multiple-room lodges strong enough to hold starving apex predators at bay, under-ice passages, air vents for bad smell and a f'cking fridge under water! Smart enough to charge rent from a less-adapted species in exchange for company and shelter. AND ON TOP OF THIS, THEY CAN TERRA-FORM AN ENTIRE DAMN ECOSYSTEM IF A BUNCH OF THEM JUST CHOSE TO! (beavers);

And also, the chillest of all animals. Despite living in the most vile ecosystem known to man, filled with predators everywhere, waiting to murder anything on sight. But they still vibe without a care in the world! :) (capybaras);

Sources: A bunch of encyclopedias I've read.

Proof: Wikipedia.

Source of image and more info on the Smithsonian zoo website: https://nationalzoo.si.edu/animals/emperor-tamarin