Legend of Barking Sands.

A time long ago, an old Hawaiian fisherman lived in a hut near the beach with his nine dogs. During his fishing trips he would tie his dogs to stakes in the sand, three to each of three stakes. He would then get into his canoe and go fishing.

One day while he was at sea and the dogs were tied as usual, he was caught in a very bad storm. For hours he battled the heavy seas until he was finally able to return to land. He was so exhausted that he crawled into his hut, forgetting to untie the dogs. When he awoke the next morning and went outside, the dogs were nowhere in sight. All he saw were three small mounds of sand where the dogs had been tied. As he stepped on one of the mounds, he heard a low bark. Another step brought another bark, still he couldn’t find the dogs. Believing the dogs had been buried in the sand because of the storm, the fisherman began to dig. As each shovelful was removed, more sand took its place. He finally gave up, and every day after that when he crossed the beach he could hear the low barking. The dogs were never found and to this day the sands of Mana have been known as the Barking Sands. After a time, the old fisherman died, some say from a broken heart for losing his dogs.

Science explanation:
The scientific explanation of this phenomenon is that the grains of Mana sand are tinny, hollow spheres. When rubbed together, the give off a popping sound similar to the barking of dogs. This only occurs when the sand is very dry. Wet sand gives off almost no sound.