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The species problem, as it has been discussed by zoologists for over a hundred years, is formed by two aspects. On the one hand, there is an objective controversy, a kind of a gap, between species as they actually exist in nature and the 'classifier's species' identified by a group-expert taxonomist; on the other hand, there is everyone's natural aspiration to identi‐ fy the species in accordance with nature, to purposefully narrow this gap, and ideally, to close it completely. [15, 9, 43]. One of the creators of the modern evolutionary synthesis, N. V. Timofeeff-Ressovsky had good grounds for considering the notion of discreteness of life to be the crucial part of biological thinking, i.e. the idea of particulate essence of biodiversi‐ ty. In other words, life-forms don't flow into one another smoothly and graduattly, but rath‐ er are divided into units, partly totally discreet, partly connected with transitional forms — the ones that haven't separated completely.

Conspecific Recognition Systems and the Rehabilitation of the Biological Species Concept in Ornithology