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Rattus rattus

(Rata Negra)

Overview

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Mammal. A native of the Indian sub-continent, this rat has now spread throughout the world. It will feed on and damage almost any edible thing. Ship rats are widespread in forest and woodlands as well as being able to live in and around buildings. A very agile rat, it often frequents the tree tops searching for food and nesting there in bunches of leaves and twigs .

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

black rat, Blue rat, European house rat, House Rat, roof rat, Root rat, Ship rat

Common Names in French:

rat noir

Common Names in German:

Hausratte

Common Names in Russian:

Крыса черная

Common Names in Spanish:

Rata Negra

Description

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Physical Description

Species Rattus rattus

A slender rat with large hairless ears, it may be grey-brown on the back with either a similarly coloured or creamish-white belly, or it may be black all over. The uniformly-coloured tail is always longer than the head and body length combined. Its body weight is usually between 120 and 160 g but it can exceed 200 g.The work of Yosida (1980) and his co-workers has shown that there are two forms of R. rattus that differ in chromosome number. The more widespread Oceanic form has 38 chromosomes and is the ship rat of Europe, the Mediterranean region, America, Australia and New Zealand. Present indications are that it is the Oceanic form that has reached islands in the South Pacific, but studies are needed to confirm this. The Asian form has probably reached some islands north of the equator, e.g. the Caroline Islands. On the basis of colour variation in rats on Ponape and Koror Islands, described by Johnson (1962) as Rattus rattus mansorius, we suspect that these rats may be the Asian form of R. rattus (Source: SPREP).

Habitat

Ship rats can be widespread, utilising most habitat types , but they show a preference for drier habitats. They generally avoid swimming.

Typically found at an altitude of 0 to 5,469 meters (0 to 17,943 feet).[1]

Ecology: Primarily commensal, but also found in a variety of natural and semi-natural habitats .[2].

List of Habitats:

Biology

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Reproduction

A placental mammal with dependent young.Litter size 3-10 (average 5-8), with frequency of litters dependent on season and food supply. The interval between litters may be as little as 27 days.

Gestation 20-22 days. Weaning 21-28 days. Sexual maturity 3-4 months. Total life may not exceed two years.

Taxonomy

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Last Revised: 2012-05-09