Like dry leaves or shapes of animals. How do they know what to mimic??
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Imagine a bush full of bugs that aren’t very well camouflaged. The bugs that look the least like the leaves they are on are more noticeable and get eaten first, meaning the bugs that blend in a bit better are the ones that reproduce.
Their babies vary in shape and color, some becoming slightly more like the leaves and some sightly less
Again the ones that look least like the leaves hey eaten first.
Repeat that millions of times and you get extremely good camouflage. And the bugs themselves never knew what to camouflage themselves as, it was the animals eating the bugs that “told” them how to look by not eating the best camouflaged ones.
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