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When did the caprimulgiform group first appear in the fossil record?

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

The caprimulgiform group, which includes nightjars and related families, first appeared in the fossil record during the Eocene Epoch, approximately 56 to 34 million years ago. Compared to many other avian orders, this group is considered relatively young.1