Sea sponges stay put with anchors that bend but don`t break
(PHYSorg.com Chemistry)

Sea sponges known as Venus` flower baskets remain fixed to the sea floor with nothing more than an array of thin, hair-like anchors made essentially of glass. It`s an important job, and new research suggests that it`s the internal architecture of those anchors, known as basalia spicules, that helps them to do it.