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American Black Bear Essay

3467 words - 14 pages

The American Black Bear is the smallest, yet most common species of Bear in North America. People have a propensity to think that Bears are very dangerous, especially to humans. In reality, Bears are harmless creatures, and have a very friendly demeanor.
Compared to all other types of bears, the American Black Bear is in the middle when it comes to size. It is smaller than a Polar Bear, but larger than a Sloth Bear. Black Bears vary in size depending on their location in the world, sex, how much food is available, the time of year, and their inherited genes.
Male and female Black Bears have an immense difference in size. Males tend to be anywhere from twenty to sixty percent larger ...view middle of the document...

The skull of an American Black Bear is much larger than that of most other North American animals. Their skull is exceptionally long and wide. Since they have such substantial jaw muscles, the American Black Bear has a large mandible to accommodate for this.
Humans and Bears have a similar skeleton. The bones they have in common include: vertebrae, pelvis, scapula, mandible, cranium, humorous, radius, ulna, tibia, fibula, phalanges, metacarpals, femur, patella, and ribs. The internal organs of an American Black Bear are also very comparable to the internal organs of a human being. The American Black Bear internal organs include: intestines, kidney, spleen, diaphragm, liver, lungs, heart, gallbladder, pancreas, and stomach.
The lungs’ obligation is to eliminate carbon dioxide and deposit oxygen into the blood, while the heart is responsible for moving the blood throughout the body. All mammals have a diaphragm; the diaphragm acts as a “curtain” that separates the thoracic and abdominal cavities. The stomach is the chief part of the digestion process and the intestines reach from the stomach to the anus. Located behind the stomach is the pancreas. The pancreas produces insulin and plays an important part in storing it in the body. The liver and the gallbladder work together to make and store bile that is produced inside a Bear’s body.
Black Bears are exceptionally intelligent creatures. They have the ability to gain knowledge quickly and they can even differentiate shapes like squares, triangles, and circles. Female Black Bears reach maturity anywhere between the ages of three and five. Male bears mature a little later between the ages of five and seven.
Bears can see as well as, if not better than, humans can see. Black Bears can see colors especially blue, green, and sometimes red wavelengths. A Black Bear’s extraordinary eyesight permits them to locate colored fruit, such as berries, that make up a large amount of a bear’s diet. A Black Bear’s eyes are round, small, and far apart. They are nearsighted. This helps them to find objects that are close to the ground.
Many studies have shown that the American Black Bear can hear better than humans. This is partially because the Black Bear has a balloon-shaped cavity around their eardrum. This is called an auditory bullae. It is formed when the entotympanic and the ectotympanic bones fuse together in the middle ear. This enhances a Black Bears hearing because it increases hearing sensitivity.
Smell is one of the Black Bear’s most superlative senses. A bear’s sense of smell is very powerful; it can smell a human almost fifteen hours after the person has passed. Their keen sense of smell is important because it helps them find food, track down their mate, sense any harmful predators, and locate their cubs if they are lost.
American Black Bears are omnivores, which means their diet consists of both plants and animals. They have a very broad...

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