Once again this is really funny and totally incorrect. The eye of Royals has very few cones mostly only rods these are middle wave photo receptors. The simply do not see blues at all. The eye structure is likely only dichromate and likely yellow reds based on the spectral response of the two cone pigments. The sensitivity is mostly on the long end of the spectrum not the short. Red is long wave. So red yes blue no. Clearly you have very little understanding of the animal "feel" IR really?

In pythons that have heat pit membrane is populated by the trigeminal nerve masses. This nerve carries signals are relayed to the optic tectum this processes the IR information and integrated with the optical information from the eye and the best guess is overlaid. If it can be separated and concentrated singly or not is open to debate. But they MOST certainly do not feel heat with the heat pits the 'see' heat. Not that this changes the response of the two cone pigments.

If you are going to make blanket statements make sure they are correct.

http://www.mapoflife.org/topics/topi...ion-in-snakes/
http://jeb.biologists.org/content/202/14/1931.full.pdf