Ichthyornithiforms can, however, be distinguished from gulls (true alcids) as soon as they open their beaks - the rear part of the upper beak and the entire lower beak are lined with conical teeth. The lower beak also possesses three joints - one at the tip, the other two at its rear ends some distance in front of the jaw joints - that allow ichthies' jaws to gape wide, allowing them to eat larger prey than other birds of similar size.
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