Rattens

Rattens is the common name used for rats, a group of medium-sized rodents in the family Muridae. In English it most often refers to species in the genus Rattus, especially the brown rat (Rattus norvegicus) and the black rat (Rattus rattus). The two species are among the most widespread mammals, capable of living in urban, rural, and wild environments. The term can also be used more broadly to include other murid rodents in some contexts.

Biology and appearance

Brown rats have a sturdy body, typically about 20 to 25 cm long, with a tail of similar length; black rats are usually smaller and more slender. Fur color ranges from gray-brown in R. norvegicus to darker tones in R. rattus. They possess strong incisor teeth that grow continually, enabling their gnawing behavior. Their senses of smell and hearing are well developed, aiding navigation and foraging in complex environments.

Ecology and behavior

Rattens are omnivorous and opportunistic feeders, consuming grains, fruits, insects, and human refuse. They reproduce rapidly, with gestation around 21 to 23 days and large, frequent litters. Social groups exhibit hierarchies and complex interactions. They are proficient climbers and swimmers, enabling access to buildings, basements, and sewers. Their adaptability supports persistent populations in diverse habitats.

Relationship with humans

Rattens are considered pests in many settings due to crop damage, contamination of food, and structural harm. They can act as disease vectors, most notably through fleas that historically transmitted plague and through other pathogens such as leptospires and Salmonella. Management involves sanitation, exclusion, traps, and targeted rodenticides, with attention to non-target effects and environmental impact. In laboratory and research contexts, rats of the genus Rattus are widely used as model organisms.

Distribution and conservation

Originating in parts of Asia, rattens spread globally through trade and exploration. Today they are found on most continents, especially in urban areas. They are not generally considered endangered, though local populations can be threatened by control measures and habitat loss.