"Things You Wouldn't Know If We Didn't Blog Intermittently."
Whoa! I thought their spins were just tissue. Thanks for educating me!
They are also artists -https://tywkiwdbi.blogspot.com/2012/09/sand-sculpture-by-puffer-fish.html
Pufferfish skeletons are a common site on Japanese beaches. They’re usually fairly solitary but they come together for mass spawning in early summer where large groups of males compete to fertilise eggs in shallow pebble beds. As the tide goes out, some fish get stranded, leaving nearby beaches scattered with their bony shells.