Frogs can throw up their entire stomachs.

For some frogs, “throwing up” can be disgustingly literal. American bullfrogs and African clawed frogs are among the species known to practice stomach eversion, turning the stomach inside out and pushing it up through the esophagus and into the mouth. Powerful contractions of the abdominal muscles help force the stomach upward, allowing a frog to quickly get rid of something irritating or potentially toxic that it has swallowed.

Once the stomach is everted, frogs can use their front feet to wipe material from its exposed lining before pulling it back inside. Experiments with African clawed frogs have shown that chemicals and mechanical stimulation can trigger the response, and researchers believe it helps clear noxious substances from the digestive system.