Consider a tall mango tree with ripe fruits as an ecosystem. On it there are several birds and mammals, which are consuming fully ripe fruits. These animals in turn bear several parasites like ticks and mites etc on their body. Now try to count the number of these individuals. There is only one producer. How many herbivores? What about the number of ticks and mites? Can you count their actual number? Then what will be the nature of the pyramid? No doubt, it is an inverted pyramid. Try to find out more examples of this kind of inverted pyramids.