The Highway Nine Bird Sanctuary is the place that Marge wanted to go on holiday to, instead of Itchy & Scratchy Land. However, it wasn't as peaceful as Marge would have wanted as all of the birds attacked the visitors. It is implied that the birds frequently attacked the visitors because they wanted birdseed, as when the birds proceeded to undergo one of their riots, Hans Moleman proceeded to call for a bag of birdseed. They had installed a high up bird feeder shaped like a diner.

Bird sanctuary

Hans Moleman at the sanctuary