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Billions of birds travel thousands of kilometers during migration.
数十亿只鸟在迁徙过程中要飞行数千公里。
Bird Banders such as Steve Phratius study one bird at a time.
像史蒂夫·弗雷斯这样的鸟类爱好者一次只会研究一只鸟。
He's already on his migration.
他已经开始迁徙了。
But new technologies can track millions of birds at once.
但新技术可以同时追踪数百万只鸟。
At Colorado State University, assistant biology professor Kyle Horton works on birdcast, which maps bird migration like this, showing nearly 800 million birds over the United States on just one night.
在科罗拉多州立大学，生物学助理教授凯尔·霍顿从事鸟类迁徙的研究，他绘制了这样的鸟类迁徙图，展示了美国近8亿只鸟在一个晚上的迁徙。
Weather radar provides birdcast data with a twist.
气象雷达可以提供一种波动的鸟类数据。
Weather scientists watch for raindrops and filter out creatures on the wing.
气象学家会观察雨滴，忽视飞行的生物。
We basically do the inverse of what meteorologists do, we remove the precipitation and maintain the biology.
我们所做的基本上与气象学家相反，我们会去除降水数据并保持生物数据。
Regular radar can't tell a flock of song birds from a swarm of bugs.
常规雷达无法分辨出一群鸣禽和一群臭虫。
Birdcast helps discern the two by adding data from bird banding records, acoustics, bird scan radar and citizen scientist using a smartphone app.
鸟况预报通过添加鸟类波段记录、声学、鸟类扫描雷达和公民科学家使用智能手机应用程序的数据来帮助区分两者。
Birdcast then provides detailed forecasts, everything from a scattering of Green Herons passing through Virginia to a chance of Yellow Warblers in Colorado.
鸟况预报随后可以提供详细的预报，包括零星飞过弗吉尼亚州的绿苍鹭，以及可能在科罗拉多州出现的黄莺。
We have algorithms, we have pipelines that automatically create forecasts four times a day.
我们有算法，有每天自动生成四次预测的渠道。
Scientists say north American bird populations have declined 30% over the past 50 years.
科学家表示，在过去的50年里，北美鸟类的数量下降了30%。
So maybe they're 12 billion, we lost 3 billion breeding birds.
所以也许它们原本有120亿只，但我们失去了30亿只繁殖鸟类。
Some of that from nighttime light pollution, drawing birds to their death.
其中一些和夜间光污染有关，导这致鸟类死亡。
So we'll create an alert to say, this is one of the bigger nights of migration.
所以我们会创建一个警报，告知这是一个较大的迁徙之夜。
It would be great if you could turn off your lights on this specific night.
如果你能在这个特定的夜晚关掉灯就太好了。
Birdcast is part of a global effort to better understand migration patterns and encourage people to turn off their lights for migrating birds.
鸟况预报是全球努力的一部分，旨在更好地了解迁徙模式，并鼓励人们为候鸟关灯。
Shelley Schlender VOA news for Collins Colorado.
美国之音新闻，雪莱·施伦德于科罗拉多州柯林斯报道。
