Interactions between species

Interspecific and intraspecific relationships

From this video you should know the difference between interspecific and intraspecific, and that interactions can be positive, negative or neutral.

Community Ecology

Interactions between species are what define ecological communities, and community ecology studies these interactions anywhere they take place. Although interspecies interactions are mostly competitive, competition is pretty dangerous, so a lot of interactions are actually about side-stepping direct competition and instead finding ways to divvy up resources to let species get along