How does industrial melanism serve as a classic textbook case of natural selection?

The story of the peppered moth is honestly one of the coolest things to look back on because it shows evolution happening in real time right in front of our eyes. Basically, before the industrial revolution, most of these moths were light-colored, which helped them blend in perfectly with the lichen-covered trees. When the smoke and soot from factories started covering everything in the mid-19th century, those light moths suddenly stood out like a sore thumb to every bird looking for a snack. It didn't take long for the darker, melanic moths to become the ones that survived and reproduced, simply because they were harder to spot against the grimy bark.

I remember reading about this quite a bit back in the day, and it really is the textbook definition of natural selection at work. It’s not that the moths decided to change color or anything crazy like that; it’s just that the environment changed, and the existing variation in their population meant that the dark ones had a better chance of making it. It’s a super clear example of how selective pressure shifts which traits get passed down. Seeing how quickly nature adapts when things get messy is honestly pretty fascinating if you think about it.