The IUCN definition renders the order Caprimulgiformes identical to the clade Strisores. Authorities that favor the use of Strisores for this group (e.g., Yuri et al. 2013 and Chen "et al." 2019) adopt a "sensu stricto" definition of the order, limiting to the family Caprimulgidae. They also elevate many (or even all) of the families traditionally placed in Caprimulgiformes to ordinal rank. This requires recognizing at least three additional orders: Nyctibiiformes, Steatornithiformes, and Podargiformes. Owlet-nightjars can be placed in their own order (Aegotheliformes) or viewed as a family within Apodiformes.