单词：cronartium flaccidum (alb. et schw. )winter
单词：cronartium flaccidum (alb. et schw. )winter 相关文章
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
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
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
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
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