But lets try the dictionary
Autopsy: An autopsy is a postmortem assessment or examination of a body to determine the cause of death. An autopsy is performed by a physician trained in pathology.
Necropsy: (′ne′kräp·sē) (medicine) To perform an autopsy.
So there :P lol
It's like tame is a type of domestication(by dictionary definitions) Necropsy is just a type of autopsy. Both words mean the same thing vets just decided to use Necropsy to distinguish it from a human autopsy but in reality the words are interchangeable. It's a socially excepted norm in certain circles but not a true definition. If you asked a 100 random people on the street in the city they couldn't tell you what a necropsy is so unless I'm talking to a vet I use the more socially recognized word.
Veterinary Dictionary: necropsy
Examination of a body after death. See also autopsy.
The noun has one meaning:
Meaning #1: an examination and dissection of a dead body to determine cause of death or the changes produced by disease
Looks similar to getting info on anteaters when I started, not exactly accurate. Oh my the number of diets back then that suggested milk and they are lactose intolerant. To cover for that instead of fix the diet people said loose poops were normal, ugh.
Oh since you will be in touch with a armadillo vet make sure you learn from him the best way to get blood from them. I know it is quite a difficult matter with anteaters but have got word from a real expert that examines a lot of wild ones that from certain veins under the tail near the anus is the best bet, still not an easy task.