To celebrate World Rat Day, we've decided to show you that pet rats can be the cutest animals ever. Just look at that rat snuggling the tiny teddy bear! Sadly, pet rats don't get as much love as they deserve. They are often mistaken as gross and filthy animals. Domestic rats, however, groom themselves just as much as cats do.

Rats are various medium-sized, long-tailed rodents. Species of rats are found throughout the order Rodentia, but stereotypical rats are found in the...