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Charles River was founded in 1947 by Henry Foster, a young veterinarian who purchased one thousand rat cages from a Virginia farm and set up a one-person laboratory in Boston overlooking the Charles River. To fulfill the regional need for laboratory animal models, he bred, fed, and cared for the animals and personally delivered them to local ...
Fuzzy rats were identified in 1976 in a Pennsylvania lab. The leading cause of death among fz/fz rats is ultimately a progressive kidney failure that begins around the age of 1 year. [34] Shorn rats were bred from Sprague Dawley rats in Connecticut in 1998. [35] They also suffer from severe kidney problems.
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 brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat and Norwegian rat, is a widespread species of common rat. One of the largest muroids, it is a brown or grey rodent with a body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. It weighs between 140 ...
The Charles River (Massachusett: Quinobequin), sometimes called the River Charles or simply the Charles, is an 80-mile-long (129 km) river in eastern Massachusetts.It flows northeast from Hopkinton to Boston along a highly meandering route, that doubles back on itself several times and travels through 23 cities and towns before reaching the Atlantic Ocean. [1]
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.
This is an accepted version of this page This is the latest accepted revision, reviewed on 5 January 2025. Order of mammals Rodent Temporal range: Late Paleocene – recent Pre๊ ๊ O S D C P T J K Pg N Capybara Springhare Golden-mantled ground squirrel North American beaver House mouse Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Mammalia Mirorder ...
Conilurus albipes - white-footed rabbit rat (extinct) Conilurus capricornensis - Capricorn rabbit rat (extinct) Conilurus penicillatus - brush-tailed rabbit rat; Genus Coryphomys. Coryphomys buehleri - Buehler's rat (extinct) Coryphomys musseri - Timor giant rat (extinct) Genus Crateromys. Crateromys australis - Dinagat bushy-tailed cloud rat