Darwin Unhinged: The Bugs in Evolution

Some more amazing examples of insect mimicry:

I would like to know the detailed history of the evolution of these purely by random mutation plus natural selection.

"Dead leaf butterfly
The underside of this butterfly's wings are truly a remarkable work of evolutionary art; they look just like a dead leaf, with faded browns, blemish spots, even jagged edges. Meanwhile, the upperside of the insect's wings display bright colors more typical of butterflies. If they're looking for mates, they'll flash their colors, but if they want to hide from predators, they simply close their wings."

Another:

"Walking leaf
Walking leaf insects are related to the walking sticks, but are in their own family (Phylliidae). As their name suggests, they have evolved to mimic leaves, rather than sticks, though their long bodies allow them to take the form of a whole leafed branch — so their camouflage is particularly advanced. The camouflage is even down to insect bite marks."