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Back roads in Australia often have hundreds of metres of gravel corrugations, or ridges. They are always a few centimetres high, spaced about 30 centimetres apart... and annoying for vehicle occupants. What causes them?
Why do beavers seem to go after the tallest, oldest, most magnificent trees? If they ate them, I could understand. But all they do is nibble at the inner bark and then go take down another. What is going on?