The answer is D. Locust.
A chameleon, crocodile, alligator, and salamander are all reptiles. A locust is an insect.
Reptiles are a class of vertebrate animals characterized by dry, scaly skin. They are ectotherms, meaning that they regulate their body temperature by absorbing heat from their environment. Reptiles include snakes, lizards, turtles, crocodiles, and alligators.
Insects are a class of arthropod animals that have a hard exoskeleton, a three-part body, six legs, and two pairs of wings. Insects are the most diverse group of animals on Earth, with over 1 million known species.
Locusts are a type of grasshopper that can form large swarms. When conditions are right, locusts can multiply rapidly and form swarms that can cover hundreds of square miles. These swarms can devour crops and other vegetation, causing widespread damage.