Lab Rat King Co.

Rat Kings, The Tangled Rodent Swarms Of Your Nightmares

The Strange and Disgusting History of Rat Kings

Rat King by TmoeGee on DeviantArt

Anon breeds rats : r/greentext

Frankenstein' Chinese scientists force male rats to give BIRTH while conjoined with female rodents in lab experiments

Laboratory Rats Gaining in Biomedical Research

Experiment No.2 - The RuneScape Wiki

Rats prefer to help their own kind. Humans may be similarly wired

Rats: Unleash the Vermin Tide (Includes Revised Rats and the Dreaded Rat Queen!) : r/DnDHomebrew

Lab Ratz Experiment 2 - Cartoon Rat - Sticker