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.