英语分级阅读 · Level 3 · nature · 约 84 词
Small Birds Travel Very Long Distances
Some small birds fly thousands of kilometers between seasons to find food and safe places.
Seasonal migration is one of nature’s most demanding endurance systems. Lightweight songbirds may cross continents between breeding and wintering grounds, timing departure with food supply and daylight length. Navigation combines celestial cues, magnetic sensing, and landscape memory, yet modern cities add hazards such as light pollution and reflective glass. Conservation groups map stopover habitats where birds refuel on insects and berries. Protecting these narrow corridors can matter as much as protecting final destinations, because a single lost rest site can break an entire route.
中文参考
季节性迁徙是自然界最考验耐力的系统之一。体重很轻的鸣禽可能在繁殖地与越冬地之间跨越大陆，并根据食物供应与日照长短把握出发时机。导航结合天体线索、磁感与地貌记忆，但现代城市又增加了光污染、反光玻璃等危险。保护组织绘制鸟类靠昆虫与浆果补充能量的停歇栖息地。保护这些狭窄廊道有时与保护终点同样重要，因为失去一处停歇点就可能切断整条路线。