Shelving system used for placement of rodent cages; usually used by scientific researchers, and often found in vivariums (areas in research facilities where live animals are kept). Anyone who uses a large amount of rats will most likely have at least one of these (eg; snake breeders). May also be called rodent rack, mouse rack, etc...
Get a rat rack, hang on it, because you may be used for medical, psychological or social studies—unbeknownst to you, and depending on what medication you're on.
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