Rat
Classification
Rats are various medium-sized, long-tailed rodents of the superfamily
Muroidea. "True rats" are members of the genus Rattus, the most well
known are the black rat, Rattus rattus, and the brown rat, Rattus
norvegicus.
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Order:
Rodentia
Superfamily:
Muroidea
Family:
Muridae
Subfamily:
Murinae
Rattus
Genus:
Fischer de
Waldheim
The brown rat also known as the common rat, originated from China is Widespread across all continents
except Antarctica. This rat is the dominant rat in most of Europe and North America.
The black rat is a common long tailed rodent, thought to originate in tropical Asia. It is largely confined
to warmer areas having been supplanted from cooler regions and urban areas by the brown rat.
Both brown rats and Black rats are considered omnivores and eat a wide range of foods, including seeds,
fruit, stems, leaves, fungi, and a variety of invertebrates and vertebrates. They can breed throughout the
year if conditions are suitable, a female producing up to five litters a year. The gestation period is only 21
days and litters can number up to fourteen, although seven is common. They reach sexual maturity in
about 5 weeks. The maximum life span is up to three years, although most barely manage one.
http://en.wikipedia.org/wiki/Brown_rat
http://en.wikipedia.org/wiki/Black_rat
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1. Temporal bone
2. Zygomatic bone
3. Zygomatic process frontal bone
4. Frontal bone
5. Nasal bone
6. Premaxilla
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7. Maxilla
8. Upper Insisor
9. Lower incisor
10. Three upper molars
11. Three lower molars
12. Mandible
13. Zygomatic process temporal
bone
14. Tympanic bulla
15. External auditory meatus
16. Mastoid process
17. Occipital condyle
18. Occipital bone
19. Interparietal bone
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Occipital bone
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Interparietal
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Tympanic bulla
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Interaural line
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Temporal bone
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Bregma
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Frontal bone
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Zygomatic arch
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Premaxilla bone
10. Nasal bone
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Occipital condyle
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Bulla
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Basioccipital
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Eustachian tube
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Basisphenoid
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Palatine
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Jugal