I found "cleptobiosis" in The Gilded Tongue, by Rod L. Evans, Ph.D. As usual, I tried to figure out what the word meant before reading its actual meaning, and, as usual, I was wrong. "Klepto", to steal, "biosis", life. So I thought it might mean grave robbing, or perhaps kidnapping, or even murder.
Not so simple. "Biosis" in this case means the mode of life, not life itself. Thus the term refers to plundering food. Certain species, like ants, rodents, golden retrievers, will take food from other species.
I tried to find a word for grave robbers. They were called "resurrectionists" for obvious reasons, but I couldn't find a technical word for what they did.
Reminds me of a poem from my childhood about the most famous resurrectionsists of them all, Burke and Hare:
Up the close and down the stair,
In the house with Burke and Hare.
Burke's the butcher,
Hare's the thief,
And Knox the man
Who buys the beef.
Knox was Dr. Knox who would buy the freshly dug up corpses, and later, the ones that didn't even have dirt on them, and even, eventually, ones with familiar faces, all in the name of science. So that he and his students could dissect them.
Their crimes, ironically, led to loosening of restrictions on what bodies could be dissected for science.
[Image of Helen MacDougal, Burke's mistress being chased by an angry mob after the crimes were discovered. Via Wikipedia]