Every one know that there are many insects. Let’s discover why are there so many insects? Of the animals with jointed legs, the insect form the largest and most diverse group and the group of animals that has had most success in adapting itself for life on the land.
Why are there so many insects
The first reason for this success is because they are small. On land their size is restricted for without the support of water their legs cannot bear the great weight of large exoskeleton. Their muscles are generally well developed and so they are very active and do not have much difficult in escaping from enemies.
Another advantage of being small is that you do not have to grow much. Insects mature quickly and produce young several times a year. Large numbers of offspring have enabled insects to adapt to practically every sort of living condition and to practically every type of food.
How do insects develop?
Primitive insects lay eggs form which hatch young which look like miniature versions of their parents. Restricted by their hard exoskeleton the offspring are forced to shed their skins in order to grow, and this happens several times before they in order to grow, and this happens several times before they reach maturity. In other higher insects a larva completely different from its parents hatches from the egg.
The caterpillar larva of the butterfly, for example, lives on plants and eats large amounts of leaves while quickly growing. Eventually it forms a hard case around itself and forms this pupa an adult butterfly emerges. The butterfly hardly feeds at all and after mating soon dies. This more advanced insect development enables the larva and adult to concentrate on different aspects of the life cycle. The larva is the passive feeding stage and the adult the active reproductive stage.
How do locust swarms start?
One of the three of locust that forms swarms in African is the Desert Locust. This locust usually lives like a grass hopper in what is called a solitary phase. Sometimes, how-ever, all the solitary locusts from a wide area are driven together, perhaps by the weather, and they may find the conditions just right for feeding and mating.
As locusts mate and lay eggs many times in a short period, enormous numbers of young locusts hatch and become stimulated by each other to form a swarm. They change colour and when all the available plants have been eaten they migrate in search of more.
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