Other animal inhabitants include ringed seals, bearded seals, walruses, polar bears, and narwhals. Other whales and dolphins on display included belugas, narwhals and dolphins. The Act extends the elephant ivory ban to include hippos, walruses, and narwhals. The others are all cetaceans&colon; beluga whales, narwhals, killer whales and short-finned pilot whales. Both meat and blubber (muktuk) are eaten from narwhals, belugas and bowheads. It is in turn the primary food source for narwhals, belugas, ringed seals, and seabirds. Like the beluga, narwhals are medium-sized whales. The government of Greenland sets limits for narwhals and belugas. Other times they corral the narwhals or belugas before striking. The occurrence of tusks in "Odobenocetops" is a convergence with narwhals. About 1,000 narwhals per year are killed, 600 in Canada and 400 in Greenland. Canadians kill about 600 narwhals per year. Bylot Island is a migratory area for narwhals. Other sounds produced by narwhals include trumpeting and squeaking door sounds. Instead narwhals possess a shallower dorsal ridge.