Alien species

伊良湖岬でサシバが1400羽飛んだ、という話を聞き、無性にタカの渡りを見に行きたくなった。でも伊良湖岬は、豊橋駅からバスで100分。とてもとても行けない。
ということで昨日、近場の稲村ヶ崎に行ってきた。突如として現れるタカ柱。1、2、3、・・・・・・21！いや23！
サシバやハチクマがどんどん点になっていき、やがて江ノ島方面へと流れていく。空にタカがいることで、上層の空気の流れが感じられる。



帰りに、鎌倉で拾ったアカボシゴマダラ（Red Ring Skirt Butterfly）
口吻が黄色かった！
This butterfly originally inhabits in China, Taiwan, Korea and northern Viet Nam but these days we can see many of them in Tokyo area, because they were presumably introduced by some insect collectors. Now, it is designated as one of invasive alien species.
Somehow, Kanagawa prefecture, relatively rich suburbs of Tokyo, is the paradise of alien species. There seem to be quite a few animal and insect collectors, who tend to spread nonnative species by letting their pets out. Since the climate here is slightly milder than that of Tokyo and western Chiba prefecture, those exotic species seem to be able to survive winter easily.