No matter what, creationists will not admit that anything we ever find can fulfill Darwin's prediction of transitional intermediates. This is why creationists demand only monstrous absurdities or issue challenges they know still couldn't be satisfied no matter how true evolution may be; because they know already that whatever they insist on seeing today we may show them tomorrow, and if that happens, they'll have to make up new excuses for why it still doesn't count. So they won't request to see anything evolution actually requires, and they usually won't define any criteria they would accept either, because they already know they won't accept anything even if we show them everything they ever ask for.

"9th Foundational Falsehood of Creationism", Youtube (May 8, 2008) - Foundational Falsehoods of Creationism

9th Foundational Falsehood of Creationism