Heavy rain and the surf eating the bottom of the dune away cause these dunes to have small landslides from time to time. These slides are normaly isolated and only small sections seem to slip at any time. The plant growth on the dunes realy does stabalise them, and prevent their total erosion. The dunes here are rather old and have been growing for quite a few dozen decades. The trees on some of the older dunes are in the hundreds of years old, and their roots are well estblished holding the sand and preventing erosion. The bear patch near the top of this dune is evidence of a recent slide, which judging from the growth is not the first on this slope. Notice the young growth at the top of the bear patch, which has not yet grown to any reasonable size since the previous slide.
