Does the insect family really form the largest group in the animal world ?

The insects constitute the largest number in the animal world. There are about 5 million species of insects. Examples of insects are the housefly, butterfly, beetle, honeybee, mosquito, grasshopper, cockroach, ant, termite and silverfish. Most insects pass through a complex metamorphosis in course of their life history.
The head of an insect bears a pair of antennae which serves as the organs of touch, taste and smell. The head also has two compound eyes which provide proper vision and two or three simple eyes which detect light or darkness. The mouth may have biting or chewing jaws or piercing and sucking structures. The head also has the brain which connects with nerve cords all over the body.
The middle part of the body, the thorax, has three pairs of jointed legs which has sticky pads or claws at the end. The thorax has one or two pairs of wings or none at all in some cases.
The abdomen or the end part of the body contain the systems

of digestion, excretion and reproduction.
The insect does not have an inner skeleton. However their bodies are covered with an exoskeleton.