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| | rat - Article and Reference from OnPedia.com |
 | | Descendants of Norwegian rats bred for research, these animals are often called "fancy rats", "coloured rats" or "colour rats." Domesticated rats tend to be both more docile than their wild ancestors and more disease prone, presumably due to inbreeding. |
 | | There are over 50 species of rats, the most well-known of which are the Brown Rat, Rattus norvegicus; the Black Rat, Rattus rattus; and the Polynesian Rat, Rattus exulans. |
 | | Like mice, rats (especially albino Rattus norvegicus) are frequently subjects of medical, psychological and other biological experiments due to their rapid growth to sexual maturity and because rats are easily kept and bred in captivity. |
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