Smelliest bird

Native to the Amazon rainforest, a strong contender for the title of the world's smelliest bird is undoubtedly the hoatzin (Opisthocomus hoazin), a bizarre-looking bird variously classified with the pheasants, cuckoos, touracos, and even in a taxonomic group entirely of its own, which stinks like cow manure. Even its local name, pava hedionda, translates as "stinking turkey". Its noxious odour is believed to derive from a combination of its exclusive diet of green leaves and, for birds, its uniquely bovine digestive system that involves a kind of foregut fermentation.

(NB: deliberate missing 't' in species name).