Are Rhino lives dreary? No. We do have compulsory daily activities, many involved with diet. Like any other critter, We need fuel. In the Rhino case, being big, that means lots of food.
And lots of chewing. That part is definitely repetitive. We just have to get to it, and chew. BUT: Why did Nature give Rhinos Mammoth Imaginative Capacities, if it isn’t to Use Them?
Right. Bon Voyage!