Giant birds are commonly seen in Marzipan City. The first giant bird ever seen was in Grubble Gum. It was trying to help Mung Daal, Chowder, Shnitzel, and a bear by laying a huge egg on them. Other species of giant birds were seen in The Vaction and Chowder and Mr. Fugu.
Some look like birds with long legs with green feathers, pigeons (but more bigger), and one seems to be like turkey that can fly.