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发表于 2021-12-12 21:28:37
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rpan 发表于 2021-12-12 20:36
今年是Brood X爆发年,蝉蛹在地下生活3,5,17年,都是质数,它们懂数学?这是个有趣的自然现象。蝉通过大量爆发,让它的天敌一次吃个饱,剩下的蝉可以生育下一代。如果不是这样,每年均衡出生,后代没有繁衍机会。
- Brood X (X is 10 in Roman numerals) is the largest brood of 17-year cicadas.
- This brood is found in three separate areas centering around Pennsylvania and northern Virginia, Indiana, and eastern Tennessee.
- The largest emergence of Brood X appears as adults only once every 17 years.
- 根据预测,明年2022将听不到蝉鸣。
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