All octopuses are venomous

ALL of them.


Contrary to what was known, all octopuses are venomous, a new study finds.

Researchers knew that the blue-ringed octopus packed venom. Now they say all octopuses and cuttlefish, and some squid are venomous. In fact they all share a common, ancient venomous ancestor, the study indicates, and the work suggests new avenues for drug discovery...

The origin of these genes also sheds light on the fundamentals of evolution, presenting a prime example of convergent evolution where species independently develop similar traits.

http://www.livescience.com/animals/090415-octopus-venom.html