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The reason why the rhinoceros bird is called the good friend of the rhinoceros is because the bird has a mutualistic relationship with the rhinoceros. The bird feeds on parasites and insects that live on the rhinoceros's skin, helping to keep the rhinoceros clean and free from pests. In return, the bird benefits from the protection provided by the rhinoceros. When the rhinoceros moves, the bird can locate new sources of food and avoid potential dangers. This relationship is known as mutualism, where both species benefit from their association with each other.
The English translation for "为什么说犀牛鸟是犀牛的好朋友" would be "Why is the rhinoceros bird considered the good friend of the rhinoceros?"