Japanese Pigmy Woodpeckers are very common bird in Japan. They occupies the niche that insectivore in the tip or end of a twig or the dense vegetation large size woodpeckers are not able to enter. There are only 2 species named "pigmy" in far-East, so maybe many Japanese think that "Pigmy" woodpeckers are not common all over the world. But when we open a book of birds in South-east Asia, we can find a lot of small woodpecker that named "Pigmy". For example, Sunda Pigmy Woodpecker, Philippine Pigmy Woodpecker and Indian Pigmy Woodpecker. From this fact, we can presume that similar niches are occupied by same Family. This pic, Japanese forages on a thin branch. Many time I observed this species forage in reed bush. Maybe reed bush is not optimal habitat, so I think it is one example of compromise in habitat selection. Anyway, these days I was thinking that what is the "Not occupied niche" in Japan. About 1 weeks ago, I came up! Do have idea of it?
コゲラ (Yungipicus kizuki) Japanese Pigmy Woodpecker 141123 Saitama
It is Bamboo forest. There are no bird species in Japan specialized to the habitat. Bamboo is distributed in far-East and South-East Asia, Central Africa and North South-America. Bamboo habitat is not common around the World. Pale-headed Woodpecker is distributed in South-East Asia and this species specialized to bamboo habitat. In Japan, the niche of bamboo forest will be occupied if Pale-headed visits Japan and maintains population or Japanese Pigmy foray to the bamboo forest. After several million years, just maybe we can see new species foraging in bamboo forests and little similar to Japanese Pigmy Woodpecker.