Eagle makes notches on the block
Don't worry, she is healthy. The eagle watches visitors of Moscow ZOO.
You may notice a hole in the concrete block where is the eagle's beak now. If at every sunrise an eagle visits a huge rock and slightly abrades the rock then after a million years the rock is absent entirely.
Let's check the story. Perhaps each time the eagle abrades the rock by 0.1 gram. 0.1 gr * 365 * 1000 000 = 36.5 ton It is about 8 cubic meters of stone. So the rock is about 2x2x2 meters . The story is true. For a milliard years the eagle may erase a rock of 20x20x20 meter size.