Between what species and under what conditions does competition arise in the forest biocenosis?

There is competition between almost all species in any community. Competition is one example of an interspecies struggle for existence. Competition can occur between representatives of different kingdoms. Animals that are not natural enemies can compete with each other for territories, for prey, for plants, etc. Many studies show that some groups of animals do not enter the foreign territory of other species. While there is no apparent struggle here, it is considered a manifestation of competition.