Helmet urchin. I know they are edible but hardly will try one - even collecting them could be risky job: they appear on stones/cliffs that are heavily pounded by dangerous surf... Posted the 3th photo for illustration (No! This didn't come to my lens - I was keeping respectful distance).
Light rain was falling in our area of the midwest USA yesterday...and one of our many squirrels decided to try to wait out the rain in the middle of its trip back to the yard: it remained 'attached' to the tree, more-or-less stationary, for at least five minutes...before proceeding