Inland Taipan
The inland Taipan also is commonly known as the Western Taipan, the small-scaled snake, or the fierce snake, is an extremely venomous snake of genus Oxyuranus, and is endemic to semi-arid regions of central east Australia.

It is an extremely fast and agile snake that can strike instantly with extreme accuracy,[20] often striking multiple times in the same attack,[21] and it envenomates in almost every case
Unlike most snakes, the inland taipan is a specialist hunter of mammals so its venom is specially adapted to kill warm-blooded species. And it has adapted to a hugely devastating scale. The highest recorded venom yield of this snake was of 110mg which is enough to kill 100 Humans or 250,000 mice at once.
