As pets, the green iguana is known to eat such foods as cooked eggs, cooked anchovies, and canned dog food. Green iguans in the wild start out eating plant and animal food. The animal food consist mostly of insects and small animals. Iguanas are animals of habit. If the first foods they eat when they are young are fruits, they will prefer fruits for the rest of their life.
Iguanas are able to learn but very little and at a slow rate.
Iguanas are not very vocal but can hiss when disturbed.