Zebras are striped, as you know. We assume the stripes are like a barcode, by which Zebras themselves can sort out the herd (they travel in big bunches). Or it may be camouflage, though that is a less pleasing possibility.

These markings are festive, and a lot of other animals have similar-ish decor. Stripes, dots, blobs, whathaveyou.

Rhinos are ourselves mostly gray on gray. Our festivity is built-in. Rhinos are subtle and complex.