What are some of the hummingbirds relatives?

Hummingbirds are part of the family Trochilidae and are closely related to several other bird families, including the swifts (family Apodidae) and the tree swifts (family Hemiprocnidae). They share a common ancestor with these birds, which all belong to the order Apodiformes. Other relatives include the oilbirds (family Steatornithidae) and the nightjars (family Caprimulgidae), though these are more distantly related. Overall, hummingbirds are unique in their size, flight capabilities, and feeding habits, distinguishing them from their relatives.