Banded krait venom stop victims' lungs from working effectively
Saw-scaled vipers start "sizzling" by rubbing together special serrated scales when threatened.
Eastern tiger snakes kill an average of one human a year
Boomslang snake venom causes victims to bleed internally.
Fer-de-lances are pit vipers from Central and South America.
Black mambas are Africa's deadliest snakes
Eastern tiger snakes kill an average of one human a year.