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04-24-2008 04:27 PM #5
Rat pic
Rats are various medium sized, long-tailed rodents of the superfamily Muroidea also known as Beto. "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. A rat has an average life span of 2-3 years[1].
Rats are distinguished from mice by their size; rats generally have bodies longer than 12 cm (5 in).Last edited by Dave Severson; 04-24-2008 at 04:34 PM.
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