The Acadia Peanut Butter Bars are packed with energy-rich ingredients that are nutritious and that your birds love to eat. In addition due to the high calorie content, you can help your garden birds get through cold, long nights, prepare for the breeding season. The Acadia Peanut Butter Bar has a hole running down the length of the interior (of approximately 1.5 cm in diameter) so that you can easily attach one inside the specially designed Acadia Peanut Butter Bar Feeder (product code: 37026) or two bars inside the Acadia Duo Peanut Butter Bar Feeder (product code: 37027).