The beak was open the entire time. I noticed the skin from the lower jaw/gullet was fluttering, too. There appears to be something lodged?
Possibly a Western Paper Wasp but I don't know. I'm very curious about this one because when I shot this I didn't know it had a grub. It stuffed the grub in the handle of the patio umbrella and it comes around often and always alone. I'd love to know what's going on here. Thanks.
At Davis Mountains State Park