I’m a home with no tenant, washed up on the shore, once I sheltered a creature, but not anymore.

I live in a school but never study, I have scales but never weigh, I have a tail but never wag, I can be caught, but never arrested.

I cling to corners, dark and high, A fragile trap where shadows lie. I spin a home, but build no door, And catch what flies, but walks no more. A touch will break my dusty thread, Left behind when the hunter's fled.

Thick and loose of hide I am, and thick and coarse of fur Strong of jaw and claw, I am a critter's predator No games, just setts, and more than match for any who disturb

I have three hearts but cannot love. I bleed blue blood, not red. I have eight arms to hold you close, and a beak upon my head. What am I?