Monkeycide

I do not think I could commit Monkeycide myself. They look, as lady Macbeth says, so like our Fathers.

Source: wiktionary

This consideration, together with our having nobler game in view, prevented us from committing monkeycide, although the temptation was always in sight.

Source: wiktionary

But happily the reflection, ‘What would Professor Huxley say?’ joined with a certain ‘am-I-not-a-man-and-a-brother’ expression about the creature, checked me in time, and saved me from a crime worse than even monkeycide; for here there was no tail that I could have pleaded in excuse.

Source: wiktionary

“MONKEYCIDE.” Harris, an assayer of Gold Hill, Nev., had a pet monkey […] Tenderly Harris nursed his little pet, but he could not save him. Jocko drank a gallon of water, rolled up his queer little eyes, and died. The Gold Hill News, which tells this bright little story, coins the word “monkey[-]cide.”

Source: wiktionary