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I guess that's true for mammalian eyes, but what about insect eyes? If the bumble brain only hold 200k neurons, how many do their eyes have on board?

~7000 elements per compound eye according to this page:

That's individual lenses, right? But it says that each lens has its own photoreceptor(s). So that is a multiple of 7000.

So if that's three photo receptors per facet, already each eye is rivaling the neuron count of the brain.