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A gastrolith, also called a stomach stone or gizzard stone, is a rock held inside a gastrointestinal tract. Gastroliths in some species are retained in the muscular gizzard and used to grind food in animals lacking suitable grinding teeth. In other species the rocks are ingested and pass through the digestive system and are frequently replaced.
Gizzard of a chicken. The gizzard, also referred to as the ventriculus, gastric mill, and gigerium, is an organ found in the digestive tract of some animals, including archosaurs (birds and other dinosaurs, crocodiles, alligators, pterosaurs), earthworms, some gastropods, some fish, and some crustaceans.
It has often been suggested that at least some dinosaurs used swallowed stones, known as gastroliths, to aid digestion by grinding their food in muscular gizzards, and that this was a feature they shared with birds. In 2007 Oliver Wings reviewed references to gastroliths in scientific literature and found considerable confusion, starting with ...
Data courtesy of George Olshevsky's dinosaur genera list. [2] Name Novelty Status Authors Age Unit ... Stomach stones and food of plesiosaurs, Science, n.s. 20, (501 ...
At least two specimens of Pterodaustro have been found, MIC V263 and MIC V243, with gizzard stones in the stomach cavity, the first ever reported for any pterosaur. These clusters of small stones with angled edges support the idea that Pterodaustro ate mainly small, hard-shelled aquatic crustaceans using filter-feeding. Such invertebrates are ...
If you like stone dinosaurs, a trip to Dinosaur Land is a memorable adventure. The park features more than 50 life-sized dinosaur statues that look as much as they did when it opened in 1963.
The discovery, also gives an insight into past ecosystems, as Mr Milàn continued: “This find is a unique glimpse into the everyday situation in the bottom of the Cretaceous sea - the sea during ...
Birds with teeth were common during the time of the dinosaurs, but a newly discovered species is changing the way scientists understand avian evolution.