▁the ▁habitat . ▁Europe ans ▁hurt ▁the ▁Wh ist ling ▁war b ler ▁population ▁by ▁def or est ing ▁areas ▁for ▁sugar c ane . ▁With ▁the ▁combination ▁of ▁vol can ic ▁activity ▁and ▁def or est ation , ▁it ▁has ▁decre ased ▁the ▁Wh ist ling ▁war b ler ▁population ▁by ▁ 5 0 %. ▁They ▁are ▁starting ▁to ▁re - in hab it ▁Sou fri ere ▁in ▁St . ▁Vincent ▁and ▁have ▁a ▁distribution ▁of ▁about ▁ 9 0   km 2 . ▁ ▁Be havior ▁and ▁e col ogy ▁ ▁Bre eding ▁ ▁The ▁wh ist ling ▁war b ler ' s ▁cup - sh aped ▁n ests ▁are ▁found ▁at ▁low ▁levels ▁and ▁sp otted ▁eggs ▁have ▁been ▁seen ▁in ▁them . ▁N est ing ▁has ▁been ▁found ▁to ▁occur ▁in ▁July ▁in ▁one ▁observation , ▁and ▁April ▁in ▁another . ▁Ch icks ▁with ▁developed ▁wings ▁from ▁a ▁few ▁days ▁old ▁to ▁a ▁week ▁were ▁seen ▁out ▁of ▁the ▁nest . ▁ ▁Diet ▁and ▁for aging ▁ ▁Wh ist ling ▁war bl ers ▁for age ▁at ▁low ▁levels ▁usually ▁from ▁the ▁ground ▁to ▁ 4 ▁m , ▁and ▁at ▁most ▁at ▁ 1 5 ▁m . ▁They ▁can ▁be ▁found ▁for aging ▁in ▁large ▁rocks ▁along ▁streams , ▁b ould ers , ▁and ▁decay ed ▁logs . ▁They ▁feed ▁on ▁insect s , ▁her b ace ous ▁plants , ▁and ▁in ▁one ▁case ▁a ▁l izard ▁species ▁was ▁found ▁in ▁the ▁st om ach ▁of ▁a ▁wh ist ling