Quick read- horaltic pose. See link.
On an early morning walk - I encountered 2 Magnificent vultures- wings spread- -atop fence posts.
This is a stunning sight! Quiet & inspiring. Searching for scientists explanation is quite an easteregg hunt.
Though it appears the spread wings act as solar panels and passive grooming method.
Mostly, here is a reminder to outstretch your arms. take a dawn walk.