The terms poison and venom are often used interchangeably, but they actually have very different meanings. It is the delivery method that distinguishes one from the other.
Poison is absorbed or ingested; a poisonous animal can only deliver toxic chemicals if another animal touches or eats it.
Venom, on the other hand, is always injected. Every venomous animal has a mechanism to inject toxins directly into another animal. Stab with tails. Slash with spines. Pierce with fangs or stings. Spike with spurs. Shoot with harpoons. Chew with teeth.
For example, frogs are usually poisonous while snakes are usually venomous.
|Purpose||Inflicts pain or illness||Inflicts pain or illness|
|Delivery method||Absorption or ingestion||Injection|
|Form||Fluid, gas or some type of solid||Usually fluid|
"Poison vs Venom." Diffen.com. Diffen LLC, n.d. Web. 23 Aug 2014. < http://www.diffen.com/difference/Poison_vs_Venom >