Pyramid of numbers in a forest ecosystem is 

Pyramid of numbers in a forest ecosystem is inverted.

Pyramid of numbers represent the number of organisms at each trophic level. In general, in an ecosystem, the number of producers is more than the number of consumers, hence the pyramid of numbers is upright in many ecosystems. However, in a forest ecosystem, the first trophic level consists of plants are less in number, since a forest has trees and lower vegetation is not much due to non-abundance of sunlight, we consider trees as the main producers. The primary consumers includes animals (including various types of insects and birds which consumes producer. Their number is large as compared to producers. The number of secondary consumers are maximum in number in a forest ecosystem. Hence, the pyramid is inverted.