The book "Report on the migration of birds in the spring and autumn of 1881. The third report" is the result of the joint work of outstanding naturalists of the 19th century: Harvey-Brown J. A. (John Alexander), Barrington Richard Munliffe, Kordo John, Kermode F. M. K. (Philip Moore Callow) and More Alexander Goodman. Their report describes in detail the movements of various species of birds during the spring and autumn periods of 1881. The authors present the results of observations made in different parts of the world and draw conclusions about the rhythms and routes of bird migration. This book is not only a scientific document, but also a valuable source of information for anyone interested in nature and birds. It not only expands our understanding of the phenomenon of migration, but also helps preserve this unique natural process for future generations.