It is distinguishable from similar species by its very strong odor caused by its excrement. It is segmented, usually feeling soft and moist. The mrow is a parasite, which feeds on the live stomach tissue of the mot. Mots eat the carcasses carrying the mrow eggs. Once inside a mot stomach, the eggs hatch and the mrow secretes an enzyme into the mot's stomach dissolving or digesting the tissue.
Any waste is excreted through the mrow's excretory pores.
Before the mrow is inside a mot stomach, the respiratory system has been working. However, inside the mot, the same process still applies, the mrow getting oxygen from inside its host. The mrow has many capillaries one cell layer underneath the surface of its moist body. Oxygen diffuses through the surface into the capillaries, transferring it through diffusion into the bloodstream along with nutrients consumed from the mot. Nitrogen, carbon dioxide, and any other gases that diffuse into the bloodstream simply diffuse out again.