On fluffy-soled feet this alpine predator hops across the top of the snow, pausing now and then, listening for the sounds of small creatures burrowing underneath... When it hears its prey, it positions one of its bone and chitin spears and thrusts it downward through the icy crust... a squeal, but the predator has not made a lethal wound. Its prey escapes, but not without leaving a trail, like breadcrumbs for the carnivore to follow.