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"Death is reason for the beauty of butterfly"

Who said that? I could not agree less. Butterflies are beautiful for their color, not their death.

Whoever said that, probably meant selection pressure.

Potentially also that if every butterfly that ever existed were still alive, we wouldn't be very fond of them.

It's from "Sohrap Sepehri" [1] an Iranian poet and painter. and I think the replies to your comments answer you question.