Observations of the Natural History of the Swallows: With a Collateral Statement of Facts Relative to Their Migration, and to Their Brumal Torpidity is a book written by Thomas Ignatius M. Forster in 1817. The book provides a detailed account of the natural history of swallows, including their physical characteristics, behavior, and habitat. Additionally, Forster explores the migration patterns of swallows and their brumal torpidity, or hibernation,...