Definition:
Mutualism | -- both species benefit |
Commensalism | -- one species benefits, the other is unaffected |
Parasitism | -- one species benefits, the other is harmed |
Competition | -- neither species benefits |
Neutralism | -- both species are unaffected |
My relationship with the birds I feed is Mutual - they eat, I enjoy watching them
When I eat fish from the lake here it is Parasitism.
When a mouse invades my house, it is Parasitism.