In the animal kingdom, insects occupy a prime position by their sheer numbers. More than one million species are known and described and many unknown taxa are yet to be discovered. High diversity these wonderful creatures present in terms of their shapes, sizes, colours and functions is truly fascinating. An innumerable number of species of insects are harmful agricultural pests and vectors of disease pathogens in animals and humans on the one hand and on the other they are highly useful and economically hugely important as pollinators of crops, predators of pests, producers of honey, silk and lac, etc. It is amazing how remarkably well organized is the social behaviour of honey bees, ants and termites, which is rarely encountered in other animals even in the advanced ones. It is strikingly interesting how these social insects transmit chemical signals to each other at a remarkably fast speed in their well organized colonies. All these attributes of insects make them fascinating subjects for scientific investigation. Human interest in insects covers vast spectrum from control of harmful ones to preserve and propagate the economically important and useful species. The field of entomology is therefore very interesting and rewarding profession.
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