▁External ▁links ▁District ▁website ▁School ▁website ▁ ▁Category : Public ▁high ▁schools ▁in ▁West ▁Virginia ▁Category : Sch ools ▁in ▁Mc D ow ell ▁County , ▁West ▁Virginia ▁Category : E du c ational ▁institutions ▁established ▁in ▁ 2 0 0 9 <0x0A> </s> ▁A ▁cot ton ▁rat ▁is ▁any ▁member ▁of ▁the ▁rod ent ▁genus ▁Sig mod on . ▁Cot ton ▁r ats ▁have ▁small ▁ears ▁and ▁dark ▁co ats , ▁and ▁are ▁found ▁in ▁North ▁and ▁South ▁America . ▁M embers ▁of ▁this ▁genus ▁are ▁distributed ▁in ▁the ▁South western ▁USA , ▁Mexico , ▁Central ▁America ▁and ▁South ▁American ▁countries ▁of : ▁Venezuela , ▁E cuador , ▁Colombia , ▁Peru , ▁Brazil , ▁Guy ana ▁and ▁Sur in ame . ▁Many ▁of ▁the ▁species ▁are ▁found ▁in ▁Mexico . ▁ ▁They ▁are ▁primarily ▁her b iv ores . ▁The ▁mol ars ▁of ▁cot ton ▁r ats ▁are ▁S - sh aped ▁when ▁viewed ▁from ▁above . ▁The ▁genus ▁name ▁literally ▁means ▁S - to oth . ▁ ▁Sig mod on ▁his pid us ▁was ▁the ▁first ▁model ▁organ ism ▁to ▁be ▁used ▁in ▁pol io ▁research . ▁ ▁Classification ▁Gen us ▁Sig mod on ▁Sub gen us ▁Sig mod on ▁Sig mod on ▁his pid us ▁species ▁group ▁Sig mod on ▁all eni ▁- ▁Allen ' s ▁cot ton ▁rat ▁Sig mod on ▁a rizona e ▁- ▁Arizona ▁cot ton ▁rat ▁Sig mod on ▁h irs ut us ▁- ▁Southern ▁cot ton ▁rat ▁Sig mod on ▁his pid us ▁- ▁His