A hundred and forty-six isolates of Trichinella from various regions of Eurasia have been identified by the crossbreeding method (1 male + 1 female). Three independent species of Trichinella: T. nativa, T. nelsoni, and T. pseudospiralis were found to parasite on the animals of this continent. The former two are dominant species of different territories. T. nativa occupies the whole continental zone to the north and the north-east of the isotherm minus 5-6 degrees C in January and T. nelsoni populate to the west and the south of this line. The both strains are registered in the borders of active zones of the isotherms mentioned above. T. pseudospiralis is autochthonous for the Australian region. Due to its plasticity, this species has also been found in the tropical part of Asia. Birds seem to be the carriers of this nematode to temperate latitudes.