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How do potoos resemble broken branches while resting?

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

Potoos, which belong to the order Caprimulgiformes, utilize a combination of specialized plumage and specific behavior to resemble broken branches while resting during the day.12

Their complex, mottled plumage—featuring patterns of gray, brown, and black—mimics the appearance of tree bark. To complete this camouflage, potoos perch vertically and adopt a motionless "broken branch" posture. By remaining still and upright on a branch or stub, they become virtually indistinguishable from the dead wood they inhabit. This effective background matching is a primary defense mechanism that allows these nocturnal birds to remain concealed from predators while they sleep throughout the day.1324