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How do caprimulgiform birds differ from owls in the placement of their eyes?

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Male common nightjar (Caprimulgus europaeus) landing — Caprimulgiform Male common nightjar (*Caprimulgus europaeus*) landing

Caprimulgiform birds differ from owls in the placement of their eyes because they possess eyes positioned laterally on the head, rather than being set within a frontal facial disk as is characteristic of owls.1

While caprimulgiforms and owls share some similarities as twilight- or night-flying birds, this difference in eye placement is a key external distinction between the two groups. Additionally, caprimulgiforms are distinguished by having flatter heads and bills and feet that are not raptorial.1