were also used. Ertebølle fishermen angled with hooks made of red deer bone, of which at least one example has been found with line attached. They spear-fished with spears made of shafts to which hazel tines were attached. Boats were dugouts a few feet wide propelled by paddles constructed of shafts to which leaf-shaped or heart-shaped blades were attached. At one end a layer of clay spread on the bottom supported hot coals, an indispensable source of heat if you were going to spend much time in the boat. Dozens of species of fish have been found in the middens. Some of the most common are pike, whitefish, cod, and ling at Østenkaer, anchovy (Engraulis encrasicolus), three-spined stickleback (Gasterosteus aculeatus) and eel at Krabbesholm. The oldest site, Yderhede, featured remains of flatfish and sharks: porbeagle, topeshark, smoothhound, and (at Lystrup Enge) spurdog. At Egsminde herring, cyprinids and European perch were found. The presence of deep-sea fish and sharks probably indicates the Ertebølle fishermen often ventured out on deep water. Whether they did so in their marshland dugouts or also owned larger, ocean-going ones is an answer that waits for more evidence. Whaling and sealing industry At Lystrup Enge, Yderhede and other places the bones of cetaceans and pinnipeds have been found; specifically, of killer whales, the white-beaked dolphin, and the bottlenose dolphin among the cetaceans. These are not animals requiring whaling voyages on the high seas. They could have been washed onto the shore or hunted in shallow waters. The seals are the ringed seal, the harp seal and the grey seal. These animals for the most part were common in the Littorina Sea but are not found in the Baltic Sea now. Again, they could have been taken on land or in the shallows. The species found raise the question of whether a whaling or sealing industry existed as such or whether the bones came from opportunistic scavenging. There is no direct evidence of voyaging out in dugouts to harpoon whales that could kill the voyagers in an instant. However, one of the two main types of pottery used was the blubber lamp, a small, oval deep dish in which you ignited a chunk of blubber or even oil with a wick. The widespread use of this lamp implies a widespread industry to obtain blubber; i.e., professional whale and seal hunting. Hunting industry Judging from the remains of animal