Ecological pyramids show or explain the number of organisms, the mass of each organism at each levels and the energy transfer at each trophic level. These are referred to as pyramid of number, pyramid of biomass and pyramid of energy.
In Oak tree, at the producer level, which is a tree, will be much smaller to that of primary consumer levels which comprises of millions of insects. This is different to normal trend of ecological pyramids, whereby the number of the producers is always the highest. That's the number of organisms decreases from the producers to the tertiary consumers.
