But ants? Ants are absolutely like that. They don't give two shits about their lives, and we're not just talking about in wartime here.
Every night, ants of the species Forelius pusillus bury their colony entrance to hide from their enemies, with a few of the ants working from the outside. Unable to reenter, they will be dead by the next morning through starvation or dehydration, or maybe they simply willed themselves to die just so they could kamikaze themselves again in the afterlife in an attempt to kill ghost bees or whatever.
"You guys have a nice night. We'll scream you a lullaby."
According to Science magazine, this is "the first known example in nature of a suicidal defense that is preemptive rather than a response to immediate danger." These ants sacrifice a handful of their own kind just to close the door, and they do it every goddamned night. Put a load of clothes on to wash, tuck the kids in and send a couple family members on a suicide mission to lock the gate.
"I will close the ever loving shit out of that door! HARDCORE!"