Instructions
Observe the lizard's reaction to movement. If it gapes its mouth open or hisses, then it is exhibiting signs of fear and it may become aggressive. Additionally, an iguana may raise its tail and stare without blinking when it is afraid.
Note any nipping or biting behavior. If the lizard attempts to snap at you or any objects you place near it, it might be because it feels that you are a predator and it is afraid of you.
Look for any changes in coloration. Some lizards, such as chameleons, can change skin color depending on mood. Some chameleons change to bright colors when intimidated in an attempt to fool predators into believing they are poisonous. Other chameleons turn the color of their surroundings as camouflage.
Observe attempts by the lizard to run or hide. Reptiles tend to remain docile while sunning, so if the lizard runs away or hides when it is approached, this may be a sign that it is startled.
How to Tell If a Lizard Is Scared
Like dogs and cats, lizards are social animals and display signs of trust and affection. Lizards can also become afraid in some circumstances and may act aggressively when startled. Since lizards may bite, scratch or even detach their own tails as a defense mechanism when they are scared, it is important to be able to recognize when they are afraid.