evidence: To many people, lizards and turtles are bizarre-looking creatures. 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. Most lizards, in reality, are harmless to humans, as are most turtles; however, there are certain members of both groups that can kill, maim, make ill, or inflict at least mild levels of pain on their hapless human victims. Some lizards are, in fact, venomous, and some are quite aggressive. [...] Iguanas possess atrophied venom glands that produce a weak harmless venom, and they are common pets to reptile collectors. Nevertheless, iguanas possess dozens of sharp serrated teeth. Although bites are relatively uncommon, they can produce serious injuries to faces, fingers, wrists, and ankles. Some of the warning signs of an impending strike by an iguana include standing on all fours, drawing in a deep breath to make the body appear larger, the lowering of the animal’s dewlap (the skin flap under its chin). Some iguanas, however, have been known to strike without warning.Tree crocodile, or Crocodile monitor (Varanus salvadorii)