Claim: The black mamba (in the Animalia Kingdom; the Serpentes Suborder and the Dendroapis Genus) and the coastal taipan Animalia Kingdom, Serpentes Suborder and Oxyuranus Genus) are two of the world's most dangerous snakes, albeit not the most venomous like the Common death adder which can strike and envenom its prey in under .15 seconds.
Evidence: Snake Most venomous snakes of the world Inland taipan Dubois' sea snake Eastern brown snake Yellow bellied sea snake Peron's sea snake Coastal taipan Many-banded krait Black-banded sea krait Black Tiger snake Mainland Tiger snake Western Australian Tiger snake Beaked sea snake