▁found ▁to ▁be ▁threatened ▁with ▁ext inction , ▁the ▁highest ▁proportion ▁of ▁any ▁m amm al ian ▁group . ▁Of ▁these , ▁ 2 3 ▁species ▁were ▁class ified ▁as ▁crit ically ▁end anger ed . ▁By ▁contrast , ▁a ▁previous ▁study ▁in ▁ 2 0 0 8 ▁had ▁found ▁only ▁ 3 8   percent ▁of ▁lem ur ▁species ▁were ▁at ▁risk ▁of ▁ext inction . ▁ ▁In ▁ 2 0 0 3 , ▁R aval oman ana ▁announced ▁the ▁Dur ban ▁V ision , ▁an ▁initi ative ▁to ▁more ▁than ▁triple ▁the ▁island ' s ▁protected ▁natural ▁areas ▁to ▁over ▁ ▁or ▁ 1 0   percent ▁of ▁Mad agas car ' s ▁land ▁surface . ▁, ▁areas ▁protected ▁by ▁the ▁state ▁included ▁five ▁Str ict ▁Nature ▁Res erves ▁( R é ser ves ▁Nature lles ▁Int égr ales ), ▁ 2 1 ▁Wild life ▁Res erves ▁( R é ser ves ▁Sp é cial es ) ▁and ▁ 2 1 ▁National ▁Park s ▁( Par cs ▁Nation aux ). ▁In ▁ 2 0 0 7 ▁six ▁of ▁the ▁national ▁par ks ▁were ▁declared ▁a ▁joint ▁World ▁Heritage ▁Site ▁under ▁the ▁name ▁Rain for ests ▁of ▁the ▁A ts in an ana . ▁These ▁par ks ▁are ▁Mar o je j y , ▁Mas o ala , ▁Ran om af ana , ▁Z ah am ena , ▁And oh ah ela ▁and ▁And ring it ra . ▁Local ▁tim ber ▁mer ch ants ▁are ▁har vest ing ▁scar ce ▁species ▁of