Unique, first in Russia FIELD mobile guide to the butterflies (Lepidoptera) of Northern Eurasia: 64 most prevalent and visible species, each with photo and drawings of imago (both male and female if different), as well as text descriptions of their appearance, reproduction cycle, way of life, habitats, feeding plants and conservation status. It is easy and fun to identify species using 12 simple determination morphological and ecological characters with 2-8 values in each of them. This app is o