Yup'ik cuisine is based on traditional subsistence food harvests (hunting, fishing and berry gathering) supplemented by seasonal subsistence activities. The Yup'ik region is rich with waterfowl, fish, and sea and land mammals. Yup'ik settled where the water remained ice-free in winter, where walruses, whales and seals came close to shore, and where there was a fishing stream or a bird colony nearby. Even if a place was not very convenient for human civilization, but had rich game, yup'ik would settle there. The coastal settlements rely more heavily on sea mammals (seals, walrusses, beluga whales), many species of fish (Pacific salmon, herring, halibut, flounder, trout, burbot, Alaska blackfish), shellfish, crabs, and seaweed. The inland settlements rely more heavily on Pacific salmon and freshwater whitefish, land mammals (moose, caribou), migratory waterfowl, bird eggs, berries, greens, and roots help sustain people throughout the region. Traditional subsistence foods are mixed with what is commercially available. Today about half the food is supplied by subsistence activities (subsistence foods), the other half is purchased from the commercial stores (market foods, store-bought foods).