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This is typical commensalism : birds benefit from the activities of elephants but do not affect the huge mammals in any way.
This can be interpreted as a clear example of commensalism similar to many shrub-understorey experiments.
The beater syndrome is a form of commensalism - the unilateral transfer of benefits from one species to another at little or no cost to the benefactor.
There are numerous other examples of symbiosis, mutualism, commensalism and parasitism between ray-finned fishes and other groups.
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