Why are all white hares united into one species?

First, we must remember the definitions of “species”. A species is a group of animals with common morphophysiological, biochemical and behavioral traits, which are capable of interbreeding with each other. All white hares have common morphological, physiological, biochemical and behavioral characteristics. They can interbreed with each other and produce healthy offspring. They live in the same area and can interact with each other. It is because of these signs that all white hares were attributed to the same species.