Why did the near extinction and migrations of wild animals occur?

为什么会发生野生动物濒临灭绝和迁徙的现象？

youdao

As the world's population grows, a lot of wild animals are forced to leave their natural home.

随着全世界人口增加，许多野生动物被迫离开它们的自然家园。

youdao

Their artistic endeavors have been preserved in paintings of wild animals, cattle, goats, humans, and scenes of daily life that extend back perhaps to 5,000 B.C..

他们的艺术成果被保存在野生动物、牛、山羊、人类以及日常生活场景的绘画中，这些场景可能可以追溯到公元前5000年。

youdao

These parks include huge colored rock formations, rivers,waterfalls,beautiful trees, other plants and many different kinds of wild animals.

VOA: special.2009.04.15

His simple needs were supplied by selling or trading the skins of wild animals in the town.

VOA: special.2009.10.31

The walls are covered with cloth pictures,flags, and the heads of wild animals.

VOA: special.2009.11.16

Lindsjo, part of the Thai Society for the Conservation of Wild Animals, decided to operate.

CNN: Volunteer vets keep Thailand's elephants on their feet

Some people believe the only viable solution to the trade of wild animals is captive breeding.

BBC: Should the location of newly discovered species be hidden?

The government is expected to formally introduce a law banning the use of wild animals in circuses.

BBC: Queen's Speech 2013: What's expected - Bill-by-bill