The growing season is long, 这里的草儿生长期很长 and the grass here can support herds all year round. 能够全年维系所有的动物群落的食物需要 Male bison weigh in at one ton. 公野牛重达一吨 In high summer, the bulls are fat from the rich grazing 在盛夏 公野牛个个吃得胖乎乎的 and in prime cond...
and the grass here can support herds all year round. 能够全年维系所有的动物群落的食物需要 Male bison weigh in at one ton. 公野牛重达一吨 In high summer, the bulls are fat from the rich grazing 在盛夏 公野牛个个吃得胖乎乎的 and in prime condition, but only a few will mate. 精神焕发.然...
There were once 60 million bison, 这里曾有六千万只北美野牛 but no animal is immune to intensive hunting by man 然而没有哪种动物能够幸免于人类的大捕杀 or the destruction of its habitat. 野牛的栖息地也惨遭破坏 And a century ago, the bison were reduced to barely 1,000. 一百年前 野牛的数量曾锐减至不...
but no animal is immune to intensive hunting by man 然而没有哪种动物能够幸免于人类的大捕杀 or the destruction of its habitat. 野牛的栖息地也惨遭破坏 And a century ago, the bison were reduced to barely 1,000. 一百年前 野牛的数量曾锐减至不到一千 Now, thanks to rigorous protection, the spe...
or the destruction of its habitat. 野牛的栖息地也惨遭破坏 And a century ago, the bison were reduced to barely 1,000. 一百年前 野牛的数量曾锐减至不到一千 Now, thanks to rigorous protection, the species is recovering. 如今 幸亏制定了严厉的保护 这一物种的数量才得以逐步恢复 The growing season is l...
The prairies of North America. 北美大草原 This rich pasture once supported the greatest herds ever seen on our planet. 这里的大草原肥沃甘美 曾经养育着地球上最大的动物群落 There were once 60 million bison, 这里曾有六千万只北美野牛 but no animal is immune to intensive hunting by man ...
This rich pasture once supported the greatest herds ever seen on our planet. 这里的大草原肥沃甘美 曾经养育着地球上最大的动物群落 There were once 60 million bison, 这里曾有六千万只北美野牛 but no animal is immune to intensive hunting by man 然而没有哪种动物能够幸免于人类的大捕杀 or the destructio...
and grass can only grow here for a few months a year. 这里的草儿只有几个月的生长期 But further south, summers are longer and the grasslands flourish. 但是在更远的南边 夏天的时间更长,草原更加茂盛 The prairies of North America. 北美大草原 This rich pasture once supported the greate...
But further south, summers are longer and the grasslands flourish. 但是在更远的南边 夏天的时间更长,草原更加茂盛 The prairies of North America. 北美大草原 This rich pasture once supported the greatest herds ever seen on our planet. 这里的大草原肥沃甘美 曾经养育着地球上最大的动物群落 There we...
But the mother has given her cubs the best possible start in life. 但是母亲已经给了它们一个最好的开端 The geese will continue grazing the tundra 雪雁还将一直在苔原上吃草 until the summer ends and they're forced to head south for the winter. 直到夏天结束 它们才会被迫南迁过冬 At the...