The Greenland Sea is has many of the organisms that form the base of the oceanic food chain. Large invertebrates, fish (such as cod, herring, redfish, halibut, and plaice), birds and mammals (including various species of seals, whales, and dolphins) all feed on the smaller invertebrates and small organisms. Mosses, lichens, and scanty bushes around the coasts serve as food to the deer and musk oxen, which in turn are hunted by the polar bear.