So ... ever wondered what happened to Mufasa's body? Simba has no chance to bury it before he fucks off to hang out with a meerkat and a warthog for several years. By the time Simba returns, he either refuses to go look for his father's mangled skeleton, or he's blocked out the memory of where it all went down. As far as the audience knows, Mufasa has turned into grass and currently exists as some gazelle shit down by the watering hole.
"It's the ciiiiiiiiiiiircle of liiiiife!"
But, of course, there's another explanation for what happened to Mufasa's remains. How long do you think Mufasa's big, meaty lion corpse was able to lay baking in the sun in a land that's now run by hyenas? (You know, the same hyenas Mufasa had forced to starve.) See, if there's one thing hyenas love more than eating dead things, that's dismembering lions -- and you can find plenty of evidence of that on the internet if you don't mind looking at animal gore. There's a pretty good chance Mufasa's body became lunch for Whoopi Goldberg and Cheech Marin's dipshit hyena characters, is what we're saying.
As for the non-edible parts of his body? Well, it might not be a coincidence that we later see Mufasa's trusted advisor get trapped in a rib cage that's suspiciously close to the size of a lion's torso.