Conus geographus Linnaeus, 1758 Geography cone, 129mm Conus geographus is the largest of the fish-eating cone shells and is also the most dangerous. Its venom has adapted to become powerful enough to quickly stun or kill a prey fish. It wouldn't do the cone much good if the fish were stung and escaped, only to die somewhere else. In addition to having highly virulent venom, it also has an aggressive attitude.
A geography cone snail (Conus geographus) The human lethal dose for its venom has been estimated at just 0.029-0.038mg for every kg of body mass. 65% of human stinging cases are fatal without medical attention – although only 36 such fatalities have been recorded since 1670. (Credit: Jeff Rotman/NPL)