セミの話が出たから、ちょっと小話を一つ
海外では羽化の周期が11年、13年、17年の蝉が多い
ここで何か気付くだろうか？そう、こいつらは素数の歳に羽化するのだッ！！！
なんでそんなことするのか？
これは他の蝉、もしくはそこらの寄生虫と活動期間と合わせないためであるッ！！例えば12年サイクルの蝉と15の奴がいるとする
こいつらは最小公倍数の６０年ごとに同時にﾜｰﾜｰやるのである
これは遺伝子が濃くなる、寄生虫に狙われやすい等のリスクが多いそれに比べ13年サイクルの蝉と17年の奴が同時に現れるのは
221年に一度しか顔を合わせないのだ！なんという自然の驚異ｯ！！
ちなみに日本の蝉は知っての通り約7年で羽化するが、これも素数である
(via sytoh)
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