accuracy antigen check checking colloidal coronavirus covid-virus detection diagnosis diagnostic-aid dropper drops extraction-reagent-tube home-use immunochromatographic-technology kit limitations limited lysis-buffer measuring-instrument medical nasal nasal-secretion plastic quality-control-C-line rapid rectangular sample sampling-tube self-testing sterile-swab swab test test-cassette testing anatomical anatomy artificial bone bones carved dirty discolored discoloured display elongated eye-sockets halloween life-like life-sized long make-believe misshapen model models nose out-of-shape partial plaster replica scary scraped shape shaped skeletal skeleton skull skulls teeth negative-result result animal Asia beast bos-taurus bovine cattle cloven-hooved common control cow cruel cruelty cud-chewing dehorned disbudded domesticated eyes fawn folds grass grazer green greenery large livestock mammal mistreatment nature nose-rope painful path pierced pierced-septum plants quadruped restraining restraint ropes ruminant snout strap Ungulate working-animal wrinkled aquarium aquatic bulbous bulbous-growth carnivore carnivorous critically-endangered crocodile crocodilian elongated-snout fish-eating-crocodile freshwater gavial gavialis-gangeticus ghara Gharial hollow-bulbous-nasal-protuberance Indian-gavial Indian-gharial interdigitated-teeth jaws long-narrow-snout long-nosed-crocodile nostril-swelling piscivorous protuberance reptile reptilian Singapore vocal-resonator water zoo