Unfortunately there are no rats up for adoption from the site this month. However, you can go into the Free Adoptions section of the fourms and look for people giving away free pets. Rats are unfortunately not very popular so you just might be able to find some ones you like that people are giving away You can also collect other types of pets and trade them for rats.
Hello there and welcome to the site, Last_Lullaby! You can get rats under this section https://www.chickensmoothie.com/adoptables/rodents, however there are not any there right now but these update monthly so be sure to check there every month. Meanwhile if you want rats sooner then you can always get some from other members! I'll send you a trade with some rats in a moment