One frog known as the Poison-Arrow has enough poison to kill about 2,200 people.
Makes me wonder what the most toxic substance on earth is?
The Merc Index carefully avoids using 'most toxic substance' because 'there can only be one' but they do list interesting comparisons but first I need to explain LD50 - this is the concentration that will kill 50% of a given population (I guess kind of like the half life in radioactivity).
Dioxin has an ld50 of .045mg per kg of body mass
Plutionium is .o15 per kg
Ricin is .001mg per kg
Clostridium botulinum .0000003mg per kg of body mass; botulism is about 10,000 times as toxic as dioxin or Plutonium -- if you want a winner Botulism is the one. Do not eat from any canned product that is bulging!! Why people want to inject this into their faces - well, that is the wonder of advertising.