and their home ranges are very much bigger. 但家族的疆土面积却大大增加

253. In savanah country huge herds of games support prides containing 20 lions or more.
     热带大草原的竞争促使鼎盛的 狮群数量达到20只 甚至更多
254. But to live here lions have had to change their habits -
     而若想在此生存 狮子必须改变它们的习性
255. prides are much smaller
     狮群规模小了很多
256. and their home ranges are very much bigger.
     但家族的疆土面积却大大增加
257. And there's an added problem -
     这里还有另一个问题
258. their food is always on the move.
     它们的食物总是在移动
259. Like the elephants,
     和大象一样

来自《行星地球 第一季 第五集 Planet Earth S01E05 沙漠》第 256 行