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There are only three kinds of relationships in the animal kingdom. The first is commensalism. One example: Fish finding hiding spots in coral reefs. Fish profit, but life for the coral doesn’t change. Then there’s mutualism, a relationship where both animals benefit from each other. The tricky thing about animals is you don’t always know what kind of relationship you’re in. Which brings me to relationship number three. The parasitic.
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John B. Routledge