What kind of bird will you often see sitting on the back of rhinoceros?

A lovely symbiotic relationship. Isn't Nature amazing?

Good example of a symbiotic relationship.

WhoLetTheDogsOut?, If by the 4th answer you mean the zebra finch. No, a zebra finch is a very small Australian songbird, commonly kept as pet.

I believe You might made a mistake, tick birds doesn't hang around large mammals like oxpeckers do

If the options had said oxpecker, I would have got this question right. Didn't know that it was also called the tickbird.

Surely the 4th answer is on the underside of the rhinoceros?