The order Caprimulgiformes, commonly known as "nightjars" or "goatsuckers," is a group of nocturnal and crepuscular birds that are characterized by their wide, gaping mouths and insectivorous diet. Synonyms for this taxonomic order include Caprimulgiformes incertae sedis and Podargiformes, as some species within this group were once classified under these names. Additionally, the order is often divided into two suborders, Caprimulgiformes and Apodiformes, with the latter including swifts and hummingbirds. However, recent genetic studies have challenged this classification, suggesting that nightjars may be more closely related to owls than previously thought.