Lake beds evaporated and then filled, herds thinned out and then grew bigger.

湖床干了又湿，兽群数量减了又增。大地被阳光炙烤后，又被雨水淹没。

Autumn is mating season. And a couple of nomadic males have started shadowing their herd.

秋季的季节。两只流浪的雄性猛犸象已经开始追寻他们兽群的足迹。

Meanwhile, the spooked herds stampede up the valley.

与此同时，受到惊吓的兽群争纷逃离山谷。

Herds – or groups of horses - can double in size every four to five years.

兽群——里指马群——每四到五年规模就会扩大一倍。

Unfortunately, it is impossible to tag more than a few individuals in a herd, flock or swarm.

不幸的，能被标定的个体只兽群、鸟群或蜂群中的少数。

The herd is kind of broken up into three distinctive groups.

兽群会分解成三个不同的小团体。

Lions are a perfect example of how they'll seek out members of the herd and target the weakest for attack.

狮子就绝佳的例子，它们挑兽群中的成员并以其中最弱的为目标发动进攻。

The predators will catch the weaker ones, the laggards, they will grab off individuals in the periphery of the group.

掠食者会捕捉体弱和落在后面的，它们会从兽群边缘抢走个体。

If separated from the group, the lone Tenontosaurus had to rely on anything available, including the environment.

倘若从兽群分散，独行的腱龙只能依靠各种防御武器包括环境。

The sense of smell in Deinonychus could alert it to a herd, a family group of plant eaters 10,15,20,30 miles away.

灵敏的嗅觉使恐爪龙能嗅到十到三十英里外的食草动物兽群。

Herds of Lystrosaurus are an easy target.

水龙兽群很容易受到攻击。

Twenty yards away, there was this majestic angelic being.

在二十码开外， 个庄严如天使般的生灵。 我们绕了几圈， 终于找到了它。 我非常兴奋。 我越过整个兽群开了一枪。 300温彻斯特马格南子弹的后坐力让我重新集中了注意力。 那种感觉就像， “哇。 ” 正股力量让我重新专注。 我们在片2000英亩的土地上又绕了五圈， 才找到我们的猎物。 在200码的距离上， 并不算特别难的射击， 我得以平复心情， 精准瞄准。 我们本应只猎取雌性动物。 我猎到一只雄性， 它有一只角有缺陷， 所以没有额外收费。 土地主人对此也很满意。 也挺有意思的。

I shot over the back of the entire herd.

越过整个兽群的背部开了一枪。

TO BREAK AWAY FROM ITS HERD.

从兽群里掉队。

To make things worse, fossil evidence shows that juveniles live alone, separated from the herd until they reach at least a third of their adult weight.

更糟的化石证据表明，幼龙独居的，它们远离兽群直到体重达到成年龙的三分之一以上。

At the same moment a sinewy brown hand caught the frightened horse by the curb, and forcing a way through the drove, soon brought her to the outskirts.

时，一只强有力的棕色大手，一把捉住了惊马的嚼环，并且在牛群中挤了一条路，不大功夫，就把她带到了兽群之外。

These Albertosaurus know that a weak member of the herd is less likely to put up a vigorous defense and so their chances of being injured are reduced.

些阿尔伯特龙知道兽群里的弱者比较不可能会奋起反抗，所以它们自己受伤的几率就降低了。

Since this duckbill skeleton was found by itself, it's easy to believe that it was either separated from the herd, or was alone when it was attacked.

因为头鸭嘴龙的骨骼被单独发现，很容易想到它要么离开了兽群或者被攻击时在独行。

Members from each herd recognize each other despite time apart, and many investigate each other's mouths with their trunks to smell what their counterparts have been eating.

尽管时间间隔不同，但每个兽群的成员都能认彼此，许多成员会用鼻子探查对方的嘴巴，以闻到对方吃过的东西。

Global media started paying attention to the roving herd about a year ago, as the beasts started wreaking havoc through Yunnan's farmlands on a seemingly aimless migration northeast.

大约一年前， 全球媒体开始关注流浪兽群，因为些野兽开始在云南的农田中肆虐， 看似漫无目的地向东北迁徙。