标签：秋日黄石公园 相关文章
Yellowstone, volcanic wonderland, two million acres of wild space, right in the heart of North America. The heat of the summer has unveiled the full extent of the Yellowstone wilderness, and for a few precious months it has blossomed. But now, Yellow
自然百科2012年
The sun has revitalized this place, and now there are more living things here than at any time of the year. The summer has brought visitors too who are enjoying Yellowstone at its most vibrant. As the sun now starts to get lower in the sky, the rich
自然百科2012年
But as many are preparing to get out, some have no choice but to stay. In the remote northeast of the Yellowstone wilderness, are the Beartooth Mountains. Here, surviving about 8,000 feet, a tree now welcomes the change of / season, the white-bark pi
自然百科2012年
But this is not much good for the tree. Its seeds have gone nowhere. A grizzly bear mother and cubs. It's unusual for a grizzly to have so many cubs. This mother has found two orphans, and adopted them. But now she has four cubs to fatten up before t
自然百科2012年
Up to 150 at a time, a fifth of its entire body weight. Then it flies as much as 15 miles away, and drills the nuts into the ground in sets of ten, placing a stone on top of the stash to mark the site. It goes back for more and more. Over the autumn,
自然百科2012年
Its now September, and the elk/ have made their way down to graze where the grass on the riverbank is still green, and they can browse the nutritious shoots of young willow trees. The males are now upping their game. This bull urinates on himself to
自然百科2012年
They may be a little safer here. But the food in the forest is far less nutritious than on the riverbanks. If they want to eat well and avoid wolves this winter, they'll need to keep on moving. As the elk move gradually downwards, they follow the riv
自然百科2012年
It cuts branches into more manageable lengths and then swims them down a network of purpose-built canals towards the dam. The pond to give this beaver protection from predators, and the canals allow it to forage far into the forest, carrying many tim
自然百科2012年
All over Yellowstone, male elk are challenging each other for dominance. The sound of Yellowstone's autumn. They're trying to win the admiration of females and gather them into a hareem, only then do they stand a chance of mating with them before win
自然百科2012年
To stay is to face the certainty of snow and wolves. To go offers the chance of an easier life, but the uncertainty of the world beyond Yellowstone. Every autumn, thousands of elk do leave Yellowstone, and as they go, they cross an invisible line out
自然百科2012年
In just a few weeks, this lake will be frozen, and the beavers wont be able to cut and move trees, but they will be able to swim right under the ice to feed from this underwater larder. Moose also eat twigs and branches and often try to take advantag
自然百科2012年
Groves of aspen/ all turn at the same time, each grove descended from one tree interconnected by roots, color coordinated. As cold air sinks further down from the mountains, it brings autumn mist to Yellowstones valleys. It was in the autumn of 1870
自然百科2012年
Now he must gather the last of his strength. The rival wants to take him on. The aim is to get an antler point into his neck. But they are evenly matched. Neither can penetrate the other's guard. Now, it's all about power. A well-aimed thrust or a br
自然百科2012年
By now the pronghorn have pushed further than any of Yellowstones animals, out of forests, through farmland and down into the wide prairies at the foot of the Rocky Mountains themselves. Their search for winter grazing takes them over a hundred miles
自然百科2012年
The return of the wolf will always be controversial. But evidence is now emerging that wolves are far more important than anyone imagined, especially back in the heart of Yellowstone. It's nearly the end of October. The cold autumn nights have brough
自然百科2012年
And for every dam, there is a new habitat for new life, and a richer, more diverse Yellowstone. But just as Yellowstone reveals the complexity of life, it also exposes its fragility. On its lofty ridges, there are signs that all is not well with the
自然百科2012年
his is a tree that needs a cold winter. Its now November and the elk have found their feeding grounds just in time, the snows of winter at their heels. Here they join other herds who come to this place every year, where the snow would be less deep an
自然百科2012年
But now, the final act of the season is about to take place. From out of apparently nowhere come the bighorn sheep, the toughest of all Yellowstones animals. They can stay here all winter on slopes and crags that the biting wind keeps clear of snow.
自然百科2012年
As the snow returns to Yellowstone, it seems like the clock is turning back. All traces of the human world are covered up. A reminder that when the heart of this great wilderness was made a national park nearly 140 years ago, it was one of the most r
自然百科2012年
Ranchers will tolerate elk as long as they don't compete too much with their cattle. But as the elk move in, their old enemy follows them out of Yellowstone, an animal that's more difficult for ranchers to accept. In their minds, fear of the wolf run
自然百科2012年