What is the Difference Between Poisonous and Venomous Snakes?

The main difference between poisonous and venomous snakes lies in the way their toxins are delivered. Here are the key distinctions:

• Poisonous snakes: These snakes are toxic when they are eaten. Their toxins are stored in their bodies, such as in their skin or liver, and can cause harm when ingested by another animal. Examples include some species of garter snakes from Oregon, which retain toxins in their livers from ingesting rough-skinned newts.
• Venomous snakes: These snakes inject their toxins through a bite or sting. Venomous snakes bite their victims, and the toxins enter the victim's body through the wound caused by the fangs or stinger. Examples include cobras and rattlesnakes, which use their fangs to inject venom into their prey.

Very few snakes are truly poisonous, as the vast majority of snake toxins are transferred by bite, making them venomous. Some species, like the Asian Tiger snake and Rhabdophis keelback snakes, are both venomous and poisonous, possessing the ability to deliver toxins through both injection and ingestion.

Comparative Table: Poisonous vs Venomous Snakes

The main difference between poisonous and venomous snakes is the method of toxin delivery. Venomous snakes inject toxins through their fangs, while poisonous snakes secrete toxins that are absorbed through the skin or ingested. Here is a table comparing the differences between poisonous and venomous snakes:

It is important to note that the term "poisonous snake" is incorrect and should be replaced with "venomous snake". There are four types of venomous snakes in the United States: rattlesnakes, copperheads, cottonmouths (or water moccasins), and coral snakes. While some sources mention that non-venomous snakes can have triangular heads, it is not a reliable indicator for venomous snakes. The best way to identify venomous snakes is by looking at the shape of their heads and the presence of pits or holes, which are characteristic of pit vipers.