What is an inverted pyramid of numbers?

If the breeding rate of the prey population is high, then even with low biomass, such a population can be a sufficient food source for predators with a higher biomass, but a low breeding rate.
For this reason, population pyramids can be turned upside down, i.e., the density of organisms at a given moment in time at a low trophic level can be lower than the density of organisms at a high level.
For example, many insects (inverted pyramid of numbers) can live and feed on one tree. The inverted biomass pyramid is characteristic of aquatic ecosystems, where primary producers (phytoplankton algae) divide very quickly, and their consumers (zooplankton crustaceans) are much larger, but have a long reproduction cycle.
