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The brown rat is a rather large murid and can weigh twice as much as a black rat (Rattus rattus) and many times more than a house mouse (Mus musculus). The head and body length ranges from 15 to 28 cm (5.9 to 11.0 in) while the tail ranges in length from 10.5 to 24 cm (4.1 to 9.4 in), therefore being shorter than the head and body.
The Indian rat snake (Ptyas mucosa) is also very large with maximum sizes of up to 3.7 m (12 ft), making it the second-largest species in the genus Ptyas. [61] [62] The Tiger rat snake (Spilotes pullatus), which usually grows to about 3 m (10 ft), has been reported to reach up to 4.2 m (14 ft), ranking it among the largest colubrids. [63]
The black rat was present in prehistoric Europe and in the Levant during postglacial periods. [9] The black rat in the Mediterranean region differs genetically from its South Asian ancestor by having 38 instead of 42 chromosomes. [10] Its closest relative is the Asian house rat (R. tanezumi) from Southeast Asia. The two diverged about 120,000 ...
The best-known Rattus species are the black rat (R. rattus) and the brown rat (R. norvegicus). The group is generally known as the Old World rats or true rats and originated in Asia . Rats are bigger than most Old World mice , which are their relatives, but seldom weigh over 500 grams (1.1 lb) in the wild.
Another zoonotic disease linked to the rat is foot-and-mouth disease. [10] Rats become sexually mature at age 6 weeks, but reach social maturity at about 5 to 6 months of age. The average lifespan of rats varies by species, but many only live about a year due to predation. [11]
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This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. The average American woman weighs about 170 pounds and stands about 5 feet, 4 inches tall. But it’s important to remember that ...
The brown rat is 16 to 20 inches (410 to 510 mm) long and weighs 1 to 2 pounds (450 to 910 g). [7] It is brown or gray in color with a lighter-colored belly. [7] It is nocturnal, and sleeps approximately 10 hours a day.