英语分级阅读 · Level 2 · 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.
Migration lets many small birds survive changing seasons. When northern areas turn cold, insects and soft fruits become scarce, so flocks travel toward milder regions. The journey is risky: storms, tall glass buildings, and tired wings can stop a bird before it arrives. Still, strong fliers complete routes that cover thousands of kilometers, guided by daylight, star patterns, and familiar coastlines. Researchers track migration with tiny tags to protect key rest stops. Clean wetlands and dark night skies help more birds finish the trip.
中文参考
迁徙让许多小鸟在季节变化中存活。北方变冷时，昆虫和软果变少，鸟群便飞向更温和的地区。旅程有风险：风暴、高大玻璃建筑和疲惫的翅膀都可能让鸟半途停下。尽管如此，强壮的飞行者仍能完成数千公里路线，依靠日光、星空与熟悉的海岸线导航。研究者用微型标签追踪迁徙，以保护关键停歇地。清洁的湿地与较暗的夜空能帮助更多鸟完成旅程。