The grizzly bear is a North American species of brown bear. The grizzly bear is what we would call an "umbrella species" because they are protected. The grizzly bears diet can range from fruit and seeds to fish and other animals such as deer and fish. They are to sustain life in a few habitats such as dense forests, meadows, plains and the arctic tundra. The cardiovascular system of the grizzly bear is quite similar to the cardiovascular system of humans consiering that they have a single heart and a series of veins and arteries.