Interesting and Applicable. This is a truly remarkable work that traces the sociological and biological impetuses for and restrictions on migration at levels from the individual through the species. Shah does a superb job of combining history and science to make her case, and even impeaches at least a few organizations currently in the headlines along the way – even while clearly having no way of knowing that she was doing so, as the book was written before they became so prominent more recently. Spanning from the guy that developed the modern taxonomic system through late breaking issues with the Trump Presidency, Shah shows a true depth to her research and builds a largely compelling case. Very much recommended.