Necropsy is specific to medical and veterinary contexts, for examining causes of death.

Medical Procedures

Necropsy is often used for animals, while 'autopsy' is more common for humans.

Not for Humans

Necropsy is a technical term; avoid using it in casual conversation unless you're discussing it specifically.

Technical Term

 but most don't shed the gear, things like lobster traps and crab pots. They hold on to them, and it eventually kills them. And the other problem is they get hit by ships. And this was an animal that was struck by a ship in Nova Scotia, Canada being towed in, where they did a necropsy to confirm the cause of death,

Brian Skerry reveals...

 necropsy undergo exhaustive tests for traces of poison if the animals have been poisoned the forest department will have failed in their role as the elephant's protector and there will be uproar in the media I figured out of Dixie I'm addicted many of the forest