Its exact etymological origins are unknown, but there are several candidates.
它的确切词是未知的,但有几可能性。
Its cause was not helped by examples such the " p" which was added to the start of ptarmigan with no etymological justification whatsoever other than the fact that the Greek word for feather, ptera, started with a " p" .
之类的例子的帮助, 它被添加到 ptarmigan 的开头, 没有任何词学理由, 除了希腊语中的羽毛一词 ptera 以“p” 开头。