What are examples of pyramid of numbers?

A pyramid of numbers illustrates the number of individual organisms at each trophic level in an ecosystem. For instance, at the base, there may be thousands of grass plants (producers), followed by hundreds of herbivores like rabbits (primary consumers), and then only a few carnivores like foxes (secondary consumers). In a marine ecosystem, a similar structure could show numerous phytoplankton at the bottom, followed by fewer small fish, and even fewer larger fish at the top. This shape demonstrates the decreasing number of organisms as one moves up the food chain.