▁He ▁has ▁studied ▁wild life ▁as ▁an ▁amateur ▁in ▁over ▁ 5 0 ▁countries ▁around ▁the ▁world ▁and ▁in ▁ 2 0 1 0 ▁he ▁edited ▁a ▁multi - author ▁book ▁entitled ▁" Sil ent ▁Summer : ▁The ▁State ▁of ▁Wild life ▁in ▁Britain ▁and ▁Ireland ", ▁published ▁by ▁Cambridge ▁University ▁Press . ▁Re views ▁of ▁the ▁book ▁include ▁comments ▁from ▁Sir ▁David ▁Att en borough ; ▁" If ▁we ▁are ▁concerned ▁about ▁the ▁environmental ▁future ▁of ▁Britain ▁and ▁Ireland , ▁then ▁we ▁must ▁know ▁as ▁much ▁as ▁possible ▁about ▁its ▁present ▁condition … . That ▁is ▁why ▁this ▁book ▁is ▁so ▁important . ▁It ▁gives ▁us ▁a ▁benchmark … . It ▁is ▁in valu able ▁now ▁– ▁and ▁in ▁years ▁to ▁come ▁it ▁will ▁be ▁ir replace able " ▁and ▁from ▁G ret chen ▁Daily , ▁the ▁Director ▁of ▁the ▁Centre ▁for ▁Conserv ation ▁Bi ology , ▁Stan ford ▁University ; ▁" The ▁book ▁is ▁absolutely ▁ter r ific . ▁An ▁all - star ▁cast ▁of ▁conservation ▁scient ists ▁and ▁pract ition ers ▁document ▁powerful ▁stories ▁of ▁loss ▁– ▁and ▁of ▁hope ▁for ▁the ▁future ▁– ▁among ▁Britain ▁and ▁Ireland ' s ▁many ▁non - human ▁inhabitants . ▁G ri pping ▁and ▁rig orous ▁– ▁a ▁core ▁foundation ▁for ▁students ▁of ▁Conserv ation ▁E col ogy ▁and ▁Environment al ▁Science ". ▁ ▁This ▁is ▁followed ▁by ▁Mac lean ' s ▁single ▁author ▁book ▁" A ▁Less ▁Green ▁and ▁Ple asant ▁Land : ▁our ▁threatened ▁wild life ", ▁published ▁by ▁Cambridge ▁University ▁Press