Bison calves are born in summer and can run within a few hours of their birth.
野牛幼崽在夏季出生，在出生后短短幾小時之內(nèi)就能奔跑ZRRr#aG|^rY^X2。
They have no choice. The herd won't wait in its eternal quest to find new grazing.
它們別無選擇eo3dsOl4saKP5I^Bo。牛群對新草場的無盡追尋可不容等待0Pmjci5D;[h,Gvn。
Smaller grazers are still found here, too.
這里也存在小型食草動物JPd^TG|jb1@;C7zL。
But they stay put instead of wandering the plains.
但是它們寧愿原地呆著，而不是在草原上游蕩，追尋食物V%(-)s]ZJ[l=d^E@,。
Prairie dogs inhabit rambling subterranean towns that stretch tens of square miles.
草原土撥鼠住在蔓延數(shù)十平方英里，錯綜復雜的地下宮殿BFmVRmDOYK5pm。
These highly social creatures stay within a short dash of their door,
這種社會化程度很高的小東西總呆在他們巢穴大門不遠處，
ready to retreat from predators or by weather.
以便在捕食者或者壞天氣來襲時，迅速退入巢中abU.DMY3C1;P^Cx%@)。
It's always maintenance work to do,
它們對巢穴總是修修補補，
but major renovations have to wait until after rain when the soil is soft.
但大型的整修還待雨后泥土松軟時再動工6K|r5L7OPw]vG。
All this working and re-working helps the land recover
這些所有的建造和修補都有助于
from the impact of so many bigger feet and appetites.
清除地上大型動物的留下的腳印和食物殘渣6GGRlI0lGY。
At summer's end, male bison help to move the sun-baked soil as the rutting season starts.
夏末，隨著發(fā)情期的開始，雄性公牛也開始幫助翻動太陽曬過的泥土.c]@3h*NeeR。
They roll in dust and paw the ground to try to dominate their rivals.
在與對手競爭中，它們甩動地上大量泥土，
The dust bath also helps to dislodge irritating insects.
這樣的泥土浴也有助于消除它們身上惱人的蟲子lmvRd~eg&VWE|lOi@t。
A prairie dog colony is usually surrounded by short, nutritious grass,
通常，草原土撥鼠的聚居地附近，短草肥美，
thanks to the many teeth and toe.
這要感謝那些食草動物勤快的牙齒和腳趾了!FhJIzxbNM#t*。
This constant grazing stimulates fresh growth
不停的食草促進新草的生長，
and also keeps the field of vision clear for spotting predators.
還給捕食者提供了清晰了踩點視線YFkETArud^。
Larger neighbours are attracted to these burgeoning meadows,
正如一萬三千年前那樣，
just as they were 13,000 years ago.
它們大塊頭的動物鄰居也被欣欣向榮的田野所吸引zzJh@).o7J*F|。