The fossil record can be a nightmare for Darwinian evolution, as animals often appear fully formed in the wrong places, don’t evolve for aeons and any assumed intermediate forms (aka missing links) tend to be more or less suspicious.
The recent discovery of two Jurassic Era mammals – Maiopatagium furculiferum and Vilevolodon diplomyl – reminds us that Darwin-only textbooks are badly outdated.
What is more, Maiopatagium looked like modern flying squirrels.