The problems of invasive species are recognized by not only scientists but also public around the world. The representative avian invasive species in Japan is Chinese Hwamei. Chinese Hwamei distributes in E China(IUCN_map). It introduced to Japan and Taiwan. Hwamei species doesn't distribute in Japan, However Taiwan Hwamei Leucodioptron taewanum distributes in Taiwan. The number of Taiwan Hwamei was recently decreased because of environmental destruction and probably compete with Chinese Hwamei. Last year I visited Taiwan. At that time, I watched only one individual and heard the songs of a few individuals.
ガビチョウ (Garrulax canorus) Chinese Hwamei 141115 Ibaraki-pref Japan
The evolutional history of Chinese Hwamei is different from the Japanese avian species. So the behaviors of it are interesting for me. The thing I wanna know most is the ecological differences of this species between Japan and China. It is known that the invasive species exhibits ecological differences between the introduced places and the origin. Why? It's simple because there are no competitive species in introduced places! I wrote former no Hwamei like species distributes in Japan. However, a lot of such species distributes in E China. So I hope to see the behavior of this species in origin place.
The interpretation by Elizabeth Kolbert published The Sixth Extinction was impressive. Her interpretation described that human put back the time and the biota throughout the world becomes similar contrary to the radiation. The evolutional history of wildlife in Japan, China, North America and so on are difference. So we can watch the impressive birds, insects and mammals when we visit other countries. The introduction of organisms break the biological community, evolutional history and the impression of birding! I hope you to have the interest for such problems.
*reference Elizabeth Kolbert(2015) The sixth extinction - (和訳本) 6度目の大絶滅