和名: アカゲラ, English: Great spotted woodpecker, Binomial name: Dendrocopos major (Linnaeus, 1758)
Wikipedia
キツツキ目 > キツツキ科 > キツツキ亜科 > アカゲラ属 > アカゲラ
Order: Piciformes > Family: Picidae > Subfamily: Picinae > Tribe: Dendropicini > Genus: Dendrocopos > Species: D. major
くちばしの長いアカゲラは多型？ Is the long-beaked Great spotted woodpecker polymorphic?
左写真, Left photo: アカゲラ（メス）, Great spotted woodpecker (female); 右写真, Right photo: くちばしの長いアカゲラ（メス）, long-beaked Great spotted woodpecker (female).
ヤマガラの撮影ができたので、水元大橋方向に歩いた。芦原の端のところでまた数人のバーダーをみかけた、近づいてみると思わぬ所にアカゲラがいた、アカゲラは芦原に残る朽ちた木の切り株をつついては虫を捕っていた。このアカゲラは普通見られるアカゲラと違っていて、インターネットで話題になっていた。くちばしがアカゲラに比べ特に長い。オオアカゲラとアカゲラの羽衣の違いを見ると、この個体はアカゲラ（メス）の羽衣を持っている。これも生物に広く見られる多型（polymorphism）なのだろうか？
Since I was able to photograph the mountain tit, I walked in the direction of Mizumoto Bridge. I saw a few more birders at the edge of the reed beds, and when I got closer, I saw a Great spotted woodpecker in an unexpected place.The woodpecker was pecking at the rotten tree stump that remained in the reed bed, catching worm. This woodpecker is different from the commonly seen Great spotted woodpecker, and has become a hot topic on the internet. The beak is particularly long compared to the Great spotted woodpecker. Looking at the difference in the plumage of the White-backed Woodpecker and the Great spotted woodpecker, this individual has the plumage of a Great spotted woodpecker (female). Is this also a polymorphism that is widely seen in living things?