Identification: creepy dangling spiderthing
It is probably a wasp mud nest with spider bodies (possibly still alive and paralyzed) used to house and grow their larvae.
See https://bugguide.net/node/view/560614
and https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=28834
The wasps are commonly called &quot;mud daubers&quot; or &quot;mud wasps.&quot;