What primary action defines a potoo's daytime concealment posture?

Answer

Stretching their bodies vertically on the broken top of a snag

When resting during the day, potoos often perch on the broken top of a snag or dead stump, stretching their bodies vertically, closing their eyes to slits, and tilting their heads back slightly.

What primary action defines a potoo's daytime concealment posture?
speciesbirdanimalpotoo