Psychology & Psychiatry

Researchers find frustration is an additional factor of addiction

A team from The University of Texas Medical Branch at Galveston (UTMB) focused on drug addiction research have pioneered a new way to study frustration as a factor in substance use disorders. The study was published in the ...

Diseases, Conditions, Syndromes

Tracking the plague in DR Congo

Already battling COVID-19 and a renewed Ebola outbreak, DR Congo is also home to one of the world's oldest sites of the plague—and there are signs that the disease may have reared its head once more.

Rat

50 species

Stenomys Thomas, 1910

Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus. Many members of other rodent genera and families are also called rats and share many characteristics with true rats.

Rats are typically distinguished from mice by their size; rats are generally large muroid rodents, while mice are generally small muroid rodents. The muroid family is very large and complex, and the common terms rat and mouse are not taxonomically specific. Generally, when someone discovers a large muroid, its common name includes the term rat, while if it is small, the name includes the term mouse - scientifically, the terms are not confined to members of the Rattus and Mus genera. Compare the taxonomic classification of the Pack rat and Cotton mouse.

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