What are the characteristics of Wilbur Zelinsky’s Migration Transition Model stages?

Here are very high levels of mobility (nomadism), but very little migration. Stage two (“Early transitional society”): During stage two a “massive movement from the countryside to cities" occurs. ... Then the net-out migration trend shifts to a net-in migration trend as more people immigrate than emigrate.

Migration trend follow demographic transition stages. People become increasingly mobile as industrialization develops. More international migration is seen in stage 2 as migrants search for more space and opportunities already in stages 3 and 4. Stage- 4 countries show less emigration and more intraregional migration.