HELP! WHAT IS THIS?

[Franci1017]

it's hard as a rock...

 

[JGT]

Giant vermetid. Pry it off and chuck it.

 

[fachatga]

I have a large set of nail clippers ibuse to get these off. They can be hard to move. You’d think j a tiny worm is an easy foe. If you just break off part of them the worm will just rebuild his house.