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。
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