A rat's ribs are hinged at the spine, enabling it to easily squeeze through the tightest spaces—like the pipes draining your toilet. And rats are great swimmers too; they can hold their breath for up to three minutes. See how quickly a rat can go from the city streets to your bathroom. <br />National Geograhpic, Nat Geo, rats, toilets, sewer, mystery, climb, rib cage, swim, survive, hinged, squeeze, pipes, drain, plumbing, city, urban, animals
