Siberian chiffchaff to be a full species due to its distinctive plumage and vocalisations, being similar to "P. s. sindianus" in these respects. Common chiffchaffs (of the nominate race) and Siberian chiffchaffs do not recognize each other's songs. Pending resolution of the status of the form "fulvescens", which is found where the ranges of common chiffchaff (of the race "abietinus") and Siberian chiffchaff connect and may or may not be a hybrid between these, "tristis" is maintained in "P. collybita" by most checklists. Siberian chiffchaff Siberian chiffchaff ("Phylloscopus (collybita) tristis") is a leaf-warbler which is usually considered a subspecies of the common
The Skies Belong to Us The Skies Belong to Us The Skies Belong to Us: Love and Terror in the Golden Age of Hijacking is a 2013 narrative nonfiction book by the American author Brendan I. Koerner. It is a history of the "golden age" of aircraft hijacking in the United States from the first incident in May 1961 through January 1973. Hijackings during this period took place as often as once a week, with about 160 incidents in total (most were to Cuba). The book looks at the causes of the epidemic, some of the more famous ones and follows in-depth the story of