Quagga

quagga \ˈkwä-gə\ noun: an extinct mammal (Equus quagga) of southern Africa that resembled and was related to the zebras

Etymology: obsolete Afrikaans, from Khoikhoi quácha

SEVENTEEN — Scientists and engineers working in Project Pantheon poured wet conrete down the mouths of test subjects. Once hardened, the resultant conrete plugs formed effective barriers to ingestion, but the test subjects invariably perished.