Arrr, matey, when treasure chests be sealed tight and keys be lost to the sea's might, it be the crafty sailor with iron fingers and a skeleton crew who unlocks the secrets of yer loot!

Remove my last, I'm a soft messy pile. Remove my first, two may dangle, four you should use for a while. As large as a world, or small and whirled as well. What am I while I'm around, pray tell?

I surround the castle and everyone is to see for protecting the king castle is my only destiny

A soft circumference at the throat. Twin woven lengths descending without order.

I'm a cradle and a safe shelter for helpless younglings and their elder. Made of sticks, scraps and feathers, high above I protect them from predators.