Interactions
Symbiosis
100

An organism that kills and consumes all or part of the body of another organism

Predator

100

An organism that is infected with a pathogen or parasite

Host

200

An organism that is hunted by another organism for food

Prey

200

An organism that causes long-term disease while leaving the host alive

Parasite

300

A species interaction in which one species kills and eats another

Predation

300

A relationship between individuals of two or more species in which at least one organism benefits from the interaction

Symbiosis

400

A plant or animal that plays a unique and crucial role in the way an ecosystem functions

Keystone species

400

A species interaction when both individual benefits from the interaction

Mutualism

500

A species interaction in which two or more individuals from the same or different species compete for the same resource in the same area

Competition

500

An association between two organisms where one benefits and the other is unaffected, neither benefiting not being harmed by the interaction

Commensalism