A worldwide community photographing and learning about wildlife
Thanks. That got me on the hunt and I think they are the "red [paper] wasp", Polistes carolina (or maybe Polistes rubiginosus).
Excellent, thanks!
Actually, looking at the broad-winged hawk, it looks closer to a red-shouldered hawk with the light wing tips and it seems possible that's the call I've heard too. Is that plausible?