The red-billed oxpecher (a bird) eats ticks off the fur of an impala (a type of antelope) the oxpecker received food and removed the ticks from the impala , is this parasitism commensalism or mutualism?

Mutualism

Explanation:

Mutualism is an ecological relationship between individuals of different species, in which both are benefited by the interaction. Because it occurs between individuals of different species, it is a relationship called interspecific, and because it benefits everyone involved, it is called a harmonic relationship. An example of this can be seen in the question above, where different species of animals help each other and do not cause problems to each other, but contribute to their well-being and survival.

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