Un hallazgo de doce mil años

This handout photo taken on April 4, 2013 and released on April 9, 2013 by the Mexican National Anthropology and History Institute shows the site where the remains of a mammoth (Mammuthus columbi) were found in Santa Ana Tlacotenco, Milpa Alta, Mexico. According to a statement released by the INAH, about 70% of the mammoth skeleton was found, which dates back some ten or twelve thousand years. AFP PHOTO/INAH

This handout photo taken on April 4, 2013 and released on April 9, 2013 by the Mexican National Anthropology and History Institute shows paleontologists and archaeologists at the site where the remains of a mammoth (Mammuthus columbi) were found in Santa Ana Tlacotenco, Milpa Alta, Mexico. According to a statement released by the INAH, about 70% of the mammoth skeleton was found, which dates back some ten or twelve thousand years. AFP PHOTO/INAH

This handout photo taken on April 4, 2013 and released on April 9, 2013 by the Mexican National Anthropology and History Institute shows the site where the remains of a mammoth (Mammuthus columbi) were found in Santa Ana Tlacotenco, Milpa Alta, Mexico. According to a statement released by the INAH, about 70% of the mammoth skeleton was found, which dates back some ten or twelve thousand years. AFP PHOTO/INAH

This handout photo taken on April 4, 2013 and released on April 9, 2013 by the Mexican National Anthropology and History Institute shows paleontologists and archaeologists at the site where the remains of a mammoth (Mammuthus columbi) were found in Santa Ana Tlacotenco, Milpa Alta, Mexico. According to a statement released by the INAH, about 70% of the mammoth skeleton was found, which dates back some ten or twelve thousand years. AFP PHOTO/INAH

This handout photo taken on April 4, 2013 and released on April 9, 2013 by the Mexican National Anthropology and History Institute shows paleontologists and archaeologists at the site where the remains of a mammoth (Mammuthus columbi) were found in Santa Ana Tlacotenco, Milpa Alta, Mexico. According to a statement released by the INAH, about 70% of the mammoth skeleton was found, which dates back some ten or twelve thousand years. AFP PHOTO/INAH

This handout photo taken on April 4, 2013 and released on April 9, 2013 by the Mexican National Anthropology and History Institute shows paleontologists and archaeologists at the site where the remains of a mammoth (Mammuthus columbi) were found in Santa Ana Tlacotenco, Milpa Alta, Mexico. According to a statement released by the INAH, about 70% of the mammoth skeleton was found, which dates back some ten or twelve thousand years. AFP PHOTO/INAH

This handout photo taken on April 4, 2013 and released on April 9, 2013 by the Mexican National Anthropology and History Institute shows paleontologists and archaeologists at the site where the remains of a mammoth (Mammuthus columbi) were found in Santa Ana Tlacotenco, Milpa Alta, Mexico. According to a statement released by the INAH, about 70% of the mammoth skeleton was found, which dates back some ten or twelve thousand years. AFP PHOTO/INAH