Odd gum observation

I was watching Nigel Marven special on anacondas. And when it showed the one yellow on there that was eating the bird I noticed something odd. The inside of its mouth was a fleshy pink, but with mine, her gums are and have always been a purplish black. I had in into the vet back in October for a parasite check and he didnt say anything about her gums, shes perfectly healthy. Its not really a worry but Im just really curious i guess. i never put much thought into it since my viper boa's mouth is also black. Here a picture that shows her dark gob.
http://i185.photobucket.com/albums/x...ne_cj7/gob.jpg

Maybe like something to do with the substrate? or sumthin or more like bacteria in urs's mouth or sumthing idk.
im not an expert.

All 4 of my anacondas, and every other conda I've ever seen has a purple mouth.. it's just the pigment.

I've always thought all anacondas had purple mouths, are you sure the one you saw in the show was an anaconda?

the show was only about anacondas. It was actually a pretty awesome one at that.

Well for some reason or another it lacked pigment in the gums.. could be genetic.