He's probably prohibited from saying anything, as by then, there is probably a strong reptilian gene in humans as we know them?
This might be related to reptile exfoliation, or loosing of the outer dermis, but because the gene is not fully founded, the process of skin shedding starts to occur, however may be at too gross of a rate?
If species are too radically different, then some genes mixings, with their proper traits, may not be possible?
Hormone luster in primates in a way is connected to skin luster as this quality shows prime.
With reptiles, there is a foundance of skin quality, however with time, due to gene set characteristics, there is a complete shedding of skin, as this outer layer has outlived its usefulness.
This process also has to do with both metabolic and basil rates of cell relational qualities, to food stuffs catabolization.
So if one breeds one species into another, then problems such as this might occur.
Humans shed, however it is a light layer of dermis, everyday.
With reptiles, this is an all at once gross happening.