There is also pressure from national population growth, once driven by high fertility rates, now driven by high immigration rates. TheU.S. population would nearly doubleby the end of the century to 650 million if netimmigration remains at 3 million people per year, roughly the ...
Gray wolves were reintroduced to Yellowstone National Park (YNP) in 1995. The population initially flourished, but since 2003 the population has experience significant reductions due to factors that may include disease-induced mortality, illegal hunting, park control pro- grams, vehicle induced deaths...
黄石国家公园简史 A Brief History of Yellowstone National Park National Geographic_1 04:23 《被遗弃的小狐狸》英语小故事The abandoned fox 00:56 《困在屋顶处的小浣熊》英语小故事 Raccoon trapped on the roof 00:57 《一只学猫发出呼噜声的乌鸦》英语小故事 A crow that learns to purr like a ...
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the nation's largest and most important bison population on public land. Yellowstone is the only place in the lower 48 states where free-ranging bison have lived continuously since prehistoric times, according to a statement from the National Park Service(NPS).The Yellowstone population is also si...
S. government to create the worlds first national park. For a young country just coming of age in the early 1800s, the discovery of Yellowstone helped define America s identity with its vast, bold landscape. 这一自然奇观以其无与伦比的美景促使美国政府辟建了世界上第一个国家公园。作为一个19...
is just as popular. The most controversial of these is Yellowstone s wolf population. Until recently, the wolf was almost extinct.奇特的喷泉与印在明信片上的美丽景色使黄石国家公园闻名遐迩。但今天，这里的野生动物数量同样引人关注，其中最有争议的是黄石国家公园狼的数目。到最近，它们已濒临灭绝。
Yellowstone National Park has started capturing bison migrating outside the park and will hold them in pens for possible slaughter as part of a population reduction program.
Wood Buffalo National Park, Canada The park was created in 1922 to protect the wood bison (森林野牛) whose population had dropped from 40 million in 1830 to less than 1.000 by 1900. The park consists of 44,807 square kilometers of northern plains. It is also the world's only natural li...
Old Faithful, Yellowstone National Park by Kathy Alexander. Though providing spectacular features that bemused and befuddled the park’s earliest visitors, the volcano is known to have been the largest ever occurring on Earth, resulting in the worldwide population falling to as little as 10,000 pe...