Now that the gourds are clean, it's time to drill the holes and clean them out. Not that there's much to clean out - just some seeds and a little dust! They're strange creatures! You should keep in mind what species of bird you would like to attract because there are preferences for the hole sizes. I chose the 1 1/2" hole, preferred by the Carolina Wren and others. You have to drill a few smaller holes in the bottom to allow for drainage. I've heard that birds love the gourds. If you hang them, they will come! At least they're natural and last for many years.