view of these patterns as they allow us to see how and when these events occur inside the jaws. Among the remains analyzed, infant and juvenile individuals are the most numerous (68% of the total) and, from the discovery of the fossil remains of two fetuses in a very good state of preservation, the presence of two pregnant females among the adults. “All of these individuals are in the age groups with a higher risk of death in modern populations. We believe that in Battalions-10 there was the gradual death of individuals from different populations of horses, around a small pool or point of water, especially in periods of scarce resources such as in times of droughts ”, says Soledad Domingo. The results have also made it possible to determine the order in which the sequences of tooth formation occur inside the jaw, as well as tooth eruption and replacement.

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Thus, they have confirmed that Hipparion sp. Sri Lanka Email Database It has the same sequence of formation of its teeth as the current Equus sp., which has repercussions in other paleontological studies, such as stable isotope analysis in these teeth. On the other hand, the order of eruption of Hipparion sp. and Equus sp. It is similar although there are differences in the tooth that erupts last. In the case of Hipparion sp. it is the third molar (which would be our wisdom tooth) and in Equus sp. it is, indifferently, either the third molar or the fourth premolar. “This fact has been related to a lower durability of milk teeth in horses of the genus Hipparion compared to those of Equus. This, in turn, is related to the greater height that horses’ teeth have acquired throughout their evolutionary history in relation to the increasing intake of hard and leathery foods and the greater longevity acquired by these animals ”

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, the researcher concludes. Cerro de los Batallones deposits About 9 million years ago, the area now known as Cerro de Batallones was made up of a system of underground caves that acted as natural traps in which numerous vertebrates, mainly carnivores, were trapped. Over time, the cavities were filled with sediment from the surroundings and shortly before they were completely filled, small lakes and muddy ponds formed over them, which functioned as a trap for large herbivores, such as elephants, giraffes, rhinos and horses. All this has made Cerro de los Batallones a world example of good fossil conservation. This work is a collaboration between paleontologists and veterinarians in which researchers from the National Museum of Natural Sciences of the CSIC, the Complutense University of Madrid and the Defense Veterinary Military Center have participated.

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