Fewer than 150 exist, 种群数量不足150只

175. And they attract the forest's rarest resident.
     这项盛事吸引了森林中最罕见的居民
176. A spirit bear.
     白灵熊
177. A white variant of the black bear.
     黑熊中的一种白色亚种
178. Fewer than 150 exist,
     种群数量不足150只
179. and they're found only here.
     仅分布在此处
180. This female has fished for salmon here for 20 years.
     这只雌性白灵熊已经在这里捕捞鲑鱼长达20年了
181. Get your timing right...
     把握好时机

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 178 行