Brown Rat

(redirected from brown rats)
Also found in: Dictionary, Thesaurus, Medical.
Related to brown rats: sewer rats

Brown Rat

 

(Rattus norvegiens), a mammal of the order Rodentia.

References in periodicals archive ?
THE brown rat is one of the most common types of the rodent.
For their study, the researchers studied samples taken from 58 rodents, including 53 brown rats, 2 mice (Mus musculus) and 3 black rats (Rattus rattus).
For example, the spread of the bubonic plague in Guayaquil did not stop, as is still believed, because of the health policies instituted, but because of the increase of the black rat population relative to that of brown rats, which were carriers of the disease.
The figures show a massive 40% decrease in the reports of brown rats, well over the national average of 23%.
Like its brown rat cousin, the grey squirrel is a great carrier of disease, especially to any reds in the neighbourhood and does immense damage to young trees and plants.
It describes a 39% increase in call-outs concerning brown rats between 1999 and 2005 - and an even more worrying 69% jump over the same period for rats during the summer, a time when they are normally less active in urban areas.
Apair of brown rats can produce 200 rat babies a year - and a full-grown one can also squeeze through ahole the size of a 10 pence piece.
Invading brown rats have run riot on the Scots isle since they were accidentally introduced by a ship a century ago.
Mistaken identity with brown rats has also led to cases of poisoning.
The area saw a 38% increase in the number of complaints about brown rats between 1998 and 2002,according to statistics from the National Pest Technicians' Association.
Black rats, also known as old English rats or ships' rats, were the only rats in England until the 18th century, when they were ousted by brown rats from Europe.
Positive indicators for pla were found in samples from 8 of these black rats and in samples from 2 of the brown rats.