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Predator

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An organism that hunts and feeds on other organisms.

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Prey

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An organism that is hunted and eaten by predators.

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Symbiosis

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A close and long-term biological interaction between two different biological organisms.

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Mutualism

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A type of symbiosis where both species benefit from the interaction.

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Commensalism

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A type of symbiosis where one species benefits and the other is neither helped nor harmed.

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Parasitism

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A type of symbiosis where one organism benefits at the expense of the other.

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Keystone Species

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A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.

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Intraspecific competition

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Competition among members of the same species for resources.

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Interspecific competition

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Competition between members of different species for resources.

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Fundamental niche

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The full range of environmental conditions under which an organism can exist.