I don't know if this would be the correct place to ask this but i also own a florida kingsnake and i just recently got him from a friend, today i fed her for the first time and after i fed her she started to open her mouth and hiss. this lasted for roughly 5 minutes and then stopped. does this sound like some type of respitory sickness or does it sound like a normal expelling of air? i dont know what is normal with the snake because i just got him. any input would be greatly appreciated.