This whole thing IMO is much ado about nothing....kind of reminds me of the Greek myth of the cyclops - supposedly giant one eyed humans. It is now thought that the cyclops myth was inspired by people who would find elephant skulls (most likely ones that were missing the tusks). If you aren't familiar with what an elephant skull looks like you could easily mistake the nasal opening (which is much closer to the forehead than most other animals) for one huge eye socket + the relatively large cranium that elephants have.
Also, if you look around on Ebay ever so often, you might see sellers offering "alien skulls" which are really emu pelvises. Seeing animals that
normally have hair without the hair and certain skulls and bones isn't something that most people are familiar with. Take hairless breeds of cats
and dogs; we know of course that they are cats and dogs, but still, they are pretty bizarre and disconcerting compared to their normally-furred
Here's an example of how something so ordinary and normally easily identifiable could be passed off as something otherworldly or possibly
Most people would utterly fail at identifying this skull as that of hippopotamus, especially since it's only the upper skull and partially buried in
dirt. It does not look like what most people would think of when they see a living hippo.
BTW, I think what this "alien" was someone's pet that likely died of natural causes and got into the hands of a taxidermist. To get rid of the fur
all they would need to do is to soak it for several hours in a solution of lime (and perhaps a couple other chemicals). This is what's done to
remove fur for the making of leather. Also, regarding the pale color, soaking the carcass for a few days in alcohol would do that, or, if the animal
did happen to be killed in such a way that it bled out it would be pale like that (but I don't see any bullet or other puncture wounds on it so
that's unlikely). Of course, it could also be "dodged" or desaturated in Photoshop. I do think it was a real animal and not an artist's
creation. A good artist could do something like that, but why bother?