Being a bat demon creature person thing, I'm sure of it.
I knew lots of different "creature persons" back at the lab. We had vampires, werewolves, zombies, demons, and some other more unconventional experimentations. Unfortunately, many of them never actually made it. Turns out the mummy gene is highly unstable and just kinda...well, they became mummies alright :/
It was discovered that the Demons were the most stable out of the bunch. Werewolves and vampires were give or take. Some people's bodies accepted the gene, others not so much. Nothing special about Zombies. They aren't the brain eating things people want you to think. Did you know Nikki Sixx is a zombie?
So, as far as the demons go, there were multiple...breeds? Species? Races? There were cat demons, dog demons, lizard demons, there was even a elephant demon. I'm the only bat demon though. They quickly halted the research on anything that could fly after that. I think you can figure out why
EDIT: Aw crap! I just had another "I shoulda done..." moment there! ><