Rat teeth are always growing because they are rodents. 

A rat’s whiskers help them feel their way around and overall navigate the world. 

Sometimes if rats are uncomfortable or scared they may poop - this is called “fear poops” - this type of poop is wetter than others. 

Rat tails themselves can grow to around 9 inches long. 

Rat tails help rats keep balance. 

Rat and human brains have many similarities.