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Mantises live solitary lives, and are cannibalistic. I assume it's more out of indifference than hate, but it's close to what you're looking for.
They are so cannibalistic. I once hatched an egg case in a terrarium and they ate their brothers and sisters almost immediately after hatching. There were baby crickets in there and they did not care for them in the slightest as the mantid population fell like a cobalt state sanctioned murder cube falls on a head.
Oh wow, I totally read the parent comment as ‘manatees’, and was like, “Odd, never heard of that, but okay.”
…
Then a dash of, “Holy shit, how’s this guy keeping manatees in a terrarium?”
I am a fan of large aquaria, but hatching a cannibalistic manatee egg case in one sounds like a terrible way to become the guy in the math problem with a cart full of X cabbages and Y heads of lettuce if I bought an equal amount of each and spent $154.26 with an 8% tax if cabbages cost $2.23 and lettuce cost $3.98.
The crickets aren't competition for the crickets.
I would live like that. If someone says hi we fight and the strongest eat the weakest. It's only fair