Abstract
Aristotle's brief accounts of some swifts and hirundines in Hist. an. 1.1 (487b24-31) and 9.30 (618a31-b2) list several species whose identification has always been taken for difficult, and continues to vary from translation to translation. I clarify this small issue on the basis of Aristotle's text alone.
I therefore assume that both passages offer sufficient information for recognizing the species in question as common swift (Apus apus) in Book 1 and red-rumped swallow (Cecropis daurica) in Books 9.