Sisyphus was an ancient Greek ruler who was just too slick for his own good. Eventually, Zeus condemned him to roll a rock up a hill for Eternity, the joke being that when the rock got near the top, it would roll back down, and the chore would be renewed. Forever.
Eternity is a long time, that’s what We Rhinos know. And We Rhinos have only been around for 50 million years.
The other lesson: If you must be irritating, keep a close eye on your audience.
Your Inner Rhino 
And Sisyphus beat the gods by choosing to accept his fate and become the greatest rock roller ever. No despair for him. I would guess that Rhinos choose in a similar manner
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I am not familiar with the denouement of S’s adventures, as you describe it.
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