Acacias are very tasty indeed, though they are not for everbody, or even every Rhino. They have thorns, which require special internal equipment to digest. For some of Us, easy-peasy.
Acacias grow in clumps, which is convenient for Rhinos. When We have sampled one bush, We proceed from there.
A word of warning: Rhinos are not easy to see when Acacia-ing. We are energtic when surprised.