Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
+1Looks like an urchin
Squishy lol that they aren’t. Don’t be shy touch it!+1
Assuming the hitchhiker isn't "squishy," my guess is that this is a small Echinometra rock-boring urchin:
https://www.liveaquaria.com/product/3080/shortspine-urchin?pcatid=3080&c=530+3080&s=ts&r=