Not only are there more insects than any other type of animal, but it's not even a close comparison. 95% of all animal species are insects and they out weight the sum of all other animals. On average any acre on earth has over a million individual insects living on it.
If you are looking to introduce someone to Nature and the wild you don't have to go very far. Right out side your door is a wilderness of creatures more numerous than you can count, weirder than you can imagine, and as beautiful as a flower.