Texas spiny lizards can be quite numerous within the boundaries of their natural range, and many are seen in backyards and residential parks. This is a remarkable new discovery in the recent years as it can help scientists find out about the relationship between snakes and lizards. Lizards tend to hang on to their victims, making them hard to remove once they have bitten. Although there are many species of venemous snakes in Texas, there are no venemous species of lizards. However, there are very few lizards that are venomous mainly iguanas, Gila Lizard, and Mexican Beaded Lizards. Poisonous lizards do not generally bite unless they are handled. Many lizards are considered menacing because of their seemingly expressionless faces combined with their claws and teeth, whereas turtles are thought of as slow-moving, docile creatures. They tend to thrive in these areas, cohabiting with mankind as humans plant arboreal habitats for these lizards to flourish in. Contrary to popular belief, most Lizards are not poisonous … Common Name Scientific Name Family; Texas Alligator Lizard: Gerrhonotus infernalis: … Venom enters the bite wound by dripping down grooves in the teeth rather than being injected through fangs, as it is with poisonous snakes. The only two known species of venemous lizard are the Gila monster and beaded lizards. Scientists also believed that those two species had evolved venom production independently from snakes. Lizards bite with teeth rather than fangs. There are some 5000 different species of lizards worldwide and, until a few years ago, only two (the Gila Monster and the Mexican Beaded Lizard) were thought to be venomous.