opossum rat: terrestrial marsupials of southern South America that resemble shrews
marsupial: mammals of which the females have a pouch (the marsupium) containing the teats where the young are fed and carried
methylenedioxymethamphetamine: a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States