A Flame shell (Limaria hians) is a striking bivalve mollusc which resembles a scallop but has a bright orange fringe of filaments emerging from between its shells. They live in colonies on the sea bed in Scottish lochs, such as in Loch Carron.
They make sticky threads to bind stones and shells into a felt-lined nest. Holes in the reef allow fresh seawater to flow through, preventing stagnation. They can't be seen unless the mat-like nest is disturbed, or torn open by an anchor or a hand.