Hundreds of them, as stated by several observers on the island in May and early June. What are these brown puffballs diving into and tumbling under breaking surf? Baby Common Eiders, a sea duck. And, where have they all gone? They have been transformed into teenagers or sub-adults, thanks to their rich diet on fly-larvae hiding in beached seaweed, and tiny marine invertebrates. Not only has their appearance changed, but many have been lost to predators. Adult male and female