"The concern about animal traffic accidents began in the 1960s and 1970s, when some non-governmental organizations in Europe and the United States began to pay attention to the impact of traffic facilities on animals. In the United States, where the highway system is the most developed, environmental protection organizations have obtained amazing data after long-term observation: on average, more than 1 million wild animals are killed or run over by cars on the highway every day. Traffic accidents are the main culprit leading to the endangered species such as leopards and Grizzlies (1)<br>In the world, people and animals used to walk in the same way, without interfering with each other. Nowadays, modern roads and railways, high-speed vehicles, ships, aircraft, huge scale, all the land and sea space is almost everywhere.<br>Human beings may have no way to go in the future.<br>
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