In 2017, researchers looked again at the bird populations.

2017年，科学家回顾了这些鸟类的数据。

And if they do, it's from healthy bird populations.

如果他们要采集，也是到健康的鸟群里采。

You'll get a real-time view of the world's bird population.

您将获得世界鸟类数量的实时视图。

In 2019, Israeli researchers published a study that examined data on bird populations.

2019年，以色列研究人员发表了一项调查鸟类数量的研究。

Among China's extensive large bird population, its known for its elegance.

在中国鸟类大家族中是出了名的优雅。

Scientists try to determine what may be causing shift in bird populations or movements.

科学家试图确定是什么导致了鸟类数量或运动的变化。

He found that building turbines had no discernible effect on bird populations.

他发现建造涡轮机对鸟类数量没有明显的影响。

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%。

Third, more modern airports are being built in the countryside, where bird populations are high.

第三，在鸟类数量较多的农村地区，越来越多的现代化机场正在被建设。

Environmentalists say there are a few easy steps people can take to help struggling bird populations.

环保人士表示，人们能够采取简单的措施来保护苦苦挣扎的鸟类种群。

This of course, was having a terrible impact on wild bird populations, really, around the world.

这当然对世界范围内野生鸟类的数量产生了可怕的影响。

Other countries with large puffin populations, such as Iceland, have also seen their bird populations drop.

其他拥有大量海雀的国家，如冰岛，鸟类数量也在下降。

In many countries, birders play an important role in spotting changes in bird populations and avian behaviour.

在许多国家，观鸟者在发现鸟类种群和鸟类行为变化方面发挥着重要作用。

Second, most countries are taking steps to protect birds and other animals, so bird populations are increasing.

其次，大多数国家都在采取措施保护鸟类和其他动物，因此鸟类的数量在增加。

Bird populations have dropped dramatically from lack of food and habitat, during migrations stretching up to 11,000 kilometers.

在长达一万一千公里的迁徙过程中，鸟类数量因缺乏食物和栖息地而大幅下降。

Bird flu is a major global threat, with a devastating impact in both farmed and wild bird populations.

禽流感是全球的一大健康威胁，对养殖和野生禽类具有毁灭性影响。

Tracking bird populations by means of regular surveys, the figures give the clearest picture yet of 49 species across Britain.

他们通过定期调查的方式追踪群鸟，其数据清晰地描绘了目前全英49种鸟类的真实状况。

A study published in September documented a 29-percent drop in the bird population in the United States and Canada since 1970.

9月份发表的一项研究表明，自1970年以来，美国和加拿大的鸟类数量下降了29%。

In early summer the bird population increases and we look forward to the return of many of our beautiful bird friends.

初夏，鸟的数量增长，我们盼望着许多美丽的鸟类朋友的回归。

So, feeders actually help bird populations increase rather than cause their decline.

因此，喂食器实际上有助于鸟类数量的增加，而不是导致鸟类数量的减少。