👉 The term "ileon" is a genus of birds in the family Passeridae. It belongs to the order Phasianidae, and is classified as an extinct bird species. Ileo means "of the Ilium," which was the ancient name for the stomach of birds. The Ileoidae is one of the largest families of birds, with around 7,000 species known worldwide. They are known for their unique beak shape and ability to fly