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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.
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] The black and brown rats diverged from other Old World rats in the forests of Asia during the beginning of the Pleistocene. [12]
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.
The reticulated python (Malayopython reticulatus) of Southeast Asia is longer but more slender, and has been reported to measure as much as 8 m (26 ft) in length and weigh up to 168 kg (370 lb). [ 1 ] [ 55 ] [ 56 ] The Burmese python , a south-east Asian species is known to reach up to 6 m (20 ft) and weigh as much as 150 kg (330 lb) and is ...
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The average weight, for a range of 50 to 225 grams (1.8 to 7.9 oz), is 125 g (4.4 oz). ... The bush rat does not show much overlap in diet with other local rodent ...
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 ...
Males weigh 357 g (12.6 oz) on average, while females are slightly smaller, weighing an average of 337 g (11.9 oz). [4] It is the second-largest member of the native North American rats, and can weigh up to a pound, roughly the size of an eastern gray squirrel. [5]