There were many things to frighten them. Sometimes a stray Horse stopped by the barrel to drink, sometimes a Robin perched on the edge for a few mouthfuls of water, and once in a while a Dragon-Fly came over to visit from the neighboring pond. It was not always the biggest visitor who scared them the worst. The Horses tried not to touch the Wigglers, while a Robin was only too glad if he happened to get one into his bill with the water. The Dragon-Flies were the worst, for they were the hungriest, and they were so much smaller that sometimes the Wigglers didn't see them coming. Sometimes, too, when they thought that a Dragon-Fly was going the other way, some of them stayed near the top of the water, only to find when it was too late that a Dragon-Fly can go backward or sidewise without turning around.