The identity of many plants and animals, on mountain-summits, separated from each other by hundreds of miles of lowlands, where Alpine species could not possibly exist, is one of the most striking cases known of the same species living at distant points, without the apparent possibility of their having migrated from one point to the other.
Espezie alpetarrik izan ezin litekeen ehundaka milia zabaleko beterriek bananduriko mendi-gailurretan landare eta animalia asko berdin-berdinak izatea, honako hau argi agertzen duen kasu ezagun nabarmenetako bat da, alegia, elkarretatik urrun dauden puntuetan batetik bestera migratzerik inola ere izan ez duten espezie berak bizi direla.