A work led by the Higher Council for Scientific Research (CSIC) has analyzed the jaws of 28 horses that lived 9 million years ago in the Community of Madrid using X-rays and computerized tomography. The study of the fossils, found in the Batallones paleontological sites (Cerro de los Batallones, Torrejón de Velasco), has allowed researchers to know details about the growth, way of life and cause of death of these prehistoric horses . “In the Batallones-10 area, a very high number of practically intact jaws have been preserved, including the entire dentition, something unusual in the fossil record. Thanks to the exceptional preservation, this is one of the few occasions in which these techniques, so common in our current dental practices, have been

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applied to the study of fossil horses. Horses are a Switzerland WhatsApp Number List very important group of animals in the paleontological record due to the abundance and wide geographical and temporal distribution of their fossils, so this type of analysis allows us to further expand the knowledge we have of them ”, explains the researcher from the CSIC Soledad Domingo, from the Doñana Biological Station. The remains analyzed correspond to horses of the genus Hipparion sp., Located on a different branch from that of current horses (of the genus Equus sp.). The results of the study, published in the journal Scientific Reports , indicate that the 28 individuals analyzed are divided into seven age groups, from newborn foals to old specimens, going through various

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intermediate ages. “Horses, like humans, have a milk dentition and a permanent dentition. However, they have the peculiarity that a large part of their high teeth are housed inside the jaw as a reserve. This reserve emerges as the animal wears down its teeth throughout its life. This is an adaptation of horses to a type of diet that includes the intake of hard and fibrous materials, such as grass, and even grit from the ground, which causes great wear on the teeth. Without taking these X-rays, it would be impossible for us to quantify the still available reserve that these horses have inside their jaws ”, adds Domingo. The eruption patterns of baby and permanent teeth as well as their progressive wear have allowed paleontologists to know very precisely the

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