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. Feel the love?
Hank gets to the more violent part of community ecology by describing predation and the many ways prey organisms have developed to avoid it.
In the world of ecology, the only constant is change—but change can be good. This video explains ecological succession and how ecological communities change over time to become beautiful, biodiverse mosaics.