Of these, 13 species are now extinct from this area due to anthropogenic impacts such as urban development, expansion of residential zones, river improvement, agricultural intensification, forest devastation, etc. Therefore, the insect is one of the few living creatures which we can investigate in detail the process of extinction caused by environmental changes.In Tokyo Metropolis, the most urban area of Japan, 127 butterflies excluding 13 accidental species have been recorded in the past. ![]() Moreover, there is a lot of distribution information by amateur researchers and enthusiasts. Butterflies are very useful as an environmental indicator because they are quite familiar for human beings and each species tends to inhabit a specific and different environment.
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