Hey Brian,

I have never noticed that with my collareds but it sounds like you have compiled a sound theory here. It makes perfect sense to me. Predators from above getting a different visual. My collareds always seem to be more paranoid of movements from above when I keeping them outside, especially from overhead airplanes. They eyeball those planes until they are way out of there field of vision....crouching down!! I think naturally in the wild they get picked off by more birds and such then by any other natural predator.

Steve Bozsik
www.hardcoreherps.com