Excuse me, why can rhinoceros tolerate rhinoceros birds playing freely on its back?

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Why can rhinoceros tolerate rhinoceros birds playing freely on its back?

It turns out that although the skin of rhinoceros is mostly as hard as armor, its folds (zhě) are very tender and thin, and it is often bitten by some insects. The rhinoceros bird perches on the back of rhinoceros, and feeds on insects hidden in the folds of rhinoceros skin. Over time, a profound friendship has been established between rhinoceros and rhinoceros birds. Rhinoceros has poor eyesight and is often countered by some animals. Rhinoceros birds have very keen vision. Whenever the enemy attacks the rhinoceros, the rhinoceros bird will fly up and down and make a harsh cry to alert its friends.