Is there a way to make it do partial reduction, instead of full?

I am thinking along the lines of "remove 75% of lizards". Not all of them. Ideally, each cycle, each lizard would be tested against a chance.

And from there, extend to all creatures / objects.

Not "all or nothing" for each creature, but "percentage chance" for each creature.

Is this something doable?

Keybounce