剧情介绍
Inthisepisode,biologistPatrickAryeetravelsacrosstheAmericastoexplorethevitalrolebiganimalsplayintheirhabitats.FromAlaskatoPatagonia,hecomesfacetofacewithgrizzlybears,spermwhalesandelephantsealstorevealhowthesegiantsareshapingtheirenvironments–andevenhelpingtoreduceclimatechange. 展开全部