> Apparently bodies (human and animal) that go into the hot pools simply dissolve from the heat and high acidity.

I've heard a couple related stories. Here's one from July:

https://www.cbsnews.com/news/yellowstone-foot-found-in-abyss-pool-hot-spring-linked-to-death/

I guess the shoe helped protect the foot.

Another case was in 2016 when a couple of adult siblings went looking for a hot springs to soak in. The brother climbed down to a pool to check the temperature, but slipped and fell in. His sister was filming him climbing down, and reportedly still had the video running as she tried to help him out.

In the end, there was nothing she could do but run to the nearest ranger station for help. By the time rangers arrived, he was, unsurprisingly, not responsive. They could not recover his body that evening, and when they returned the next day, there was no sign of him. They believed his body had already dissolved. They recorded the temperature of the pool as right around boiling. The park service thankfully declined to release the video his sister took.

That's a pretty grim reminder to respect the signs. He died a terrifying and painful death, and his sister undoubtedly had that scene burned into her memory.