As a herpetologist with a keen interest in the diverse world of reptiles, I've spent considerable time studying the various species of lizards, particularly those that possess venom. While the term "poisonous" is often used colloquially to describe venomous creatures, it's important to clarify that "venomous" refers to animals that actively inject venom through a bite, whereas "poisonous" typically refers to animals that are toxic to touch or consume. With that distinction in mind, let's delve into the fascinating world of venomous lizards.

Helodermatidae Family: This family includes the Gila monster (*Heloderma suspectum*) and the Mexican beaded lizard (*Heloderma horridum*). These are the only two venomous lizards in the world. They possess venom glands and modified salivary glands that allow them to deliver a potent venom through their bites. The venom of helodermatids is a complex mixture of enzymes and proteins that can cause severe pain, swelling, and in some cases, necrosis.

Iguaninae Subfamily: The statement about iguanas being venomous is a common misconception. While some members of the Iguaninae subfamily, such as the green iguana, have sharp teeth and can deliver a powerful bite, they are not venomous. It's important to note that their bites can still be quite dangerous due to the potential for infection.

Varanidae Family: The Tree crocodile, or Crocodile monitor (*Varanus salvadorii*), is a large monitor lizard known for its fearsome appearance and powerful jaws. However, like most monitor lizards, it is not venomous. It uses its strength and speed to subdue prey rather than venom.

Misconceptions: It's crucial to address the misconception about snapping turtles. Snapping turtles (*Chelydra serpentina* and *Macrochelys temminckii*) are not lizards but rather part of the turtle family. They have powerful jaws and sharp beaks but do not possess venom glands.

In conclusion, while there are very few venomous lizards, their unique biology and the potential danger they pose make them a subject of great interest. It's essential to approach all wildlife with respect and caution, understanding that even non-venomous species can be dangerous in their own right.

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Some lizards are, in fact, venomous, and some are quite aggressive.Gila monster (Heloderma suspectum) ... Snapping turtles (Chelydra serpentina and Macrochelys temminckii) ... Mexican beaded lizard (Heloderma horridum ) ... The Iguanas (subfamily Iguaninae) ... Tree crocodile, or Crocodile monitor (Varanus salvadorii)More items...read more >>