What animals are in a rhinos food chain?

Rhinos are herbivores, so unless hidden in the grass and eaten by accident there aren't any animals in the rhino's food chain.

The rhino doesn't feature much in other animals food chain either. Lions may occasionally get a calf, but an adult rhino is pretty much safe from predation unless it gets really ill. Eventually it will die though, and then it'll be eaten by scavengers.