Talking Caterpillars: Obligate versus Facultative Interactions.
Obligate interactions are those in which one or both partners must participate in the interaction to survive.
Facultative interactions are those in which the partners may participate in the interaction, but they don't have to.
Example: certain aphids cannot survive unless they are tended by ants.
Thus they have an obligate interaction with ants. However, the ants don't
need the aphids to survive. Their interaction with the aphids is facultative.
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