You know, I have somewhere to start. And I will start with the legend. Obviously the https://app.warera.io/user/69abda911f0663a58dfceda1 is an honorable mention, because he gave the RAT idea. But the next honorable mention is The Ratatouille.
The most famous rat in the world is Ratatouille! The next famous is probably Rattata from Pokemon or maybe if you can't make a difference from rat and mouse the tables would shift to Jerry, Stuart and Pikachu. But if you trust me, the Rats are different and we go with Rats! [Which one is more famous, what do you think? Maybe you have honorable mentions?]

Rats are capable of metacognition. It is the ability to reflect on their own thoughts and know whether or not they know something. [So before you smack them in the head, remember, they might know where you store you coffee grounds, and next time you are drinking famous second use beans.]
They possess high levels of empathy and have been shown in studies to free trapped companions and share food, even choosing to help another rat before eating snacks themselves. This level of compassion is not always seen in humans! [This is why we love you https://app.warera.io/user/69abda911f0663a58dfceda1.
A rat's teeth never stop growing; they continuously wear them down by gnawing on hard objects to keep them at a manageable length. [so whenever you hear them in the wall, they don't do it just to piss you off. They actually are making sure they can live comfortable another day!]

They have Incredible breeding rate: A single pair of rats can produce up to 2,000 descendants in a year. This exponential growth is due to their ability to reach sexual maturity in just 5-6 weeks and have litters of 6-12 pups every 3-4 weeks. [Doesn't it remind you a babyboom of Germany or Lithuania?]
Rat-transmitted diseases - most notably the plague have killed hundreds of millions of people throughout human history. [And this is why we need the mew mew! And yes, I mean cats, ffs. Sorry https://app.warera.io/user/69abda911f0663a58dfceda1!]
Rats have poor eyesight and navigate largely by smell and touch, using their whiskers. To mark their territory and find their way around, they constantly urinate as they move. [EEW. I should have not read this! Sorry for letting you all know!]
Special thanks go to:
https://app.warera.io/user/691ed74bd9075fc1db542693
https://app.warera.io/user/6a05bc1f578457141e1bddf5
https://app.warera.io/user/696870939c53138d72fbf4ac
https://app.warera.io/user/69abda911f0663a58dfceda1
https://app.warera.io/user/6a08c4cd00808544f7993111
https://app.warera.io/user/6a67acb7ea7ec15af8ff9b23
https://app.warera.io/user/6977b56bdfb35c158dfb7b9e
https://app.warera.io/user/69fcd8229e183606d9885982
https://app.warera.io/user/6a1dd074f99098784fa43860
https://app.warera.io/user/6878d7a4c7da4340d38ae643
https://app.warera.io/user/6997074c9d27a4a583bd3b36
https://app.warera.io/user/6a05f3c84ccc3c36b7de2c11
https://app.warera.io/user/698f6021922ea51b23ca98d6

Full image: https://imgur.com/Cwb4i8C