Well, Luis, I'm glad you brought up the flash. Why? Because it caused me to look at the EXIF data in length. I was a bit perplexed when all I could find was Microsoft Windows Photo Gallery as a tool to move the images from your camera to be resized to your harddrive. The reason being ... I was thinking, initially, you used Photoshop. However, I see that I am wrong.
I Googled that particular program and it has minor recoloring capabilities, specifically hue, constrast ... etc. etc. This made me doubt myself for a minute, but then I realized something while looking at all of your pictures. All of which were taken at the same speed, with the same flash from the same camera ... the green background you have the normal appearing animals on is different from the one you have the sunburnt ones on. It was so simple I was a bit thrown off.
I am certain that all you did was adjust the entire image. For your viewing pleasure ... I have provided examples.
Please note the right hand side of this photograph, it is the unaltered version as provided by Luis. Pay attention to the color of the background. Now, please note the left side of the photograph, an altered version I adjusted via Photoshop with the same technique of tweaking the Red Green and Blue values in "Color Balance" that I showed before. Notice anything interesting?
Now ... please direct your attention to the left side of this collection of photographs. You will notice that it is the same photograph, just stacked. The top photograph is the unaltered version as provided by Luis, note the color of the carpet. Now, pay attention to the pic below, a version I altered myself with the RGB values, not the color of the carpet. Now, direct your attention to the right side of the collection of photographs. Again ... same photograph. Again, the top version is what Luis offered, note the color of the carpet. Now, look at the picture below it, I altered this and reverted it back to the values it should be, note the color of the carpet.
Yet another example. Photo edited by me on the left, photo unaltered from Luis on the right. Again ... color of the carpet.
And a final image ... where I had not previously noted that the normal was quite discolored as well compared to the picture of the entire litter. Again, my reverted version left, his altered version right.
Coincidence? Not likely.
So ... now what, Luis?
Still no reasoning behind the same boa appearing normal and then sunburnt again? Flash isn't an excuse. I debunked that one. You have a program capable of the simple altering I presented just now. So ...?