Bird anatomy Birds have a four-chambered heart, in common with mammals, and some reptiles (mainly the crocodilia). This adaptation allows for an efficient nutrient and oxygen transport throughout the body, providing birds with energy to fly and maintain high levels of activity. A ruby-throated hummingbird's heart beats up to 1200 times per minute (about 20 beats per second). Many birds possess a muscular pouch along the esophagus called a crop. The crop functions to both soften food and regulate its flow through the system by storing it temporarily. The size and shape of the crop is quite variable among the birds. Members
Country food country foods in the NWT's area include mammals and birds (caribou, moose, ducks, geese, seals, hare, grouse, ptarmigan), fish (lake trout, char, inconnu (coney), whitefish, pike, burbot) and berries (blueberries, cranberries, blackberries, cloudberries). In the eastern Canadian Arctic, Inuit consume a diet of foods that are fished, hunted, and gathered locally. This may include caribou, walrus, ringed seal, bearded seal, beluga whale, polar bear, berries, and fireweed. The cultural value attached to certain game species, and certain parts, varies. For example, in the James Bay region, a 1982 study found that beluga whale meat was principally used as dog food,