When birds move, the insects or plants they eat often do not, possibly upsetting ecosystems unchanged for thousands of years.
当鸟类迁移，它们所捕食的昆虫，或是作为食物的各类植物却仍留在原处，这就有可能会扰乱当地数千年未曾改变的生态系统。
When that happens, many trees like walnuts, oaks and pines, rely exclusively on so-called "scatter hoarders", such as birds, to move their seeds to new localities.
当这种情况发生时，许多树，如核桃树、橡树和松树，完全依靠所谓的“分散贮藏者”，如鸟类，将它们的种子转移到新的地方。
Secondly, they tend to move forward when scavenging for food, unlike birds and lobsters, both of which are considered unlucky to eat on New Year's Day.
其次，他们往往在消化食物的同时会向前前行，不像鸟类和龙虾，这两个被认为在新的一年是不吉利的食物。
Huddle forms when hundreds, even thousands, of males crowd together.The birds move constantly, slowly rotating from the cold outside rings to the warm, wind-free center.
当成百上千只雄帝企鹅挤在一起时就形成了一个大“团”。这些雄帝企鹅不断地移动着，从寒冷的外圈慢慢地转动到温暖无风的中心部位。
I only draw few of them because they move to another side when the birds move suddenly.
本来有成20人的摄友，由于突然间雀鸟飞到另一边而大举迁走，令我只可以画到部份队友。
I only draw few of them because they move to another side when the birds move suddenly.
本来有成20人的摄友，由于突然间雀鸟飞到另一边而大举迁走，令我只可以画到部份队友。
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