Which bird groups belong to the order Caprimulgiformes?

The order Caprimulgiformes comprises approximately 120 species of soft-plumaged birds. The major groups belonging to this order include:

• Nightjars
• Nighthawks
• Potoos
• Frogmouths
• Owlet-frogmouths
• The oilbird1

These birds are generally characterized by their enormous gapes, cryptic coloration, and nocturnal or twilight-active habits. While they share some superficial resemblances to owls, they are distinct in their anatomy, including their non-raptorial feet and bills. The order is widely distributed globally, though it is notably absent from New Zealand and certain oceanic islands.123