The mammoth bones were discovered in what are believed to have been traps used by human hunters.
The discovery "represents a watershed, a turning point in what we until now imagined to be the interaction between hunter-gatherers with these huge herbivores", Diego Prieto Hernández, director of the institute, said in a statement.
Researchers have worked at the site, near where President Andres Manuel Lopez Obrador's government is building a new airport for Mexico City, for nearly 10 months, recovering 824 bones in the roughy 26-feet-deep pit. Over 10 months, archaeologists exhumed 824 bones - corresponding to 14 animals - from the two tusker traps. Experts say the remains correspond to at least 14 individual mammoths. The newly discovered bones will serve to add to the museum's collection.
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Archaeologists thought early humans only killed mammoths if the animals were trapped or hurt.
Remains of camels and a horse were also discovered in the traps, suggesting they were used for multiple pray.
Wooly mammoths, elephant-like creatures that once inhabited nearly every continent, became extinct about 4,000 years ago. Mammoths, many researchers assumed, were only attacked by humans when hunters happened upon the animals in a compromised position - a mammoth stuck in a swamp, for example. According to CNN's Guy, the bones of one mammoth were arranged in "symbolic formation", and intriguingly, one of the bones showed signs of a healed fracture.
"They must have considered it fearless and ferocious, showing their respect with this particular arrangement", INAH archaeologist Luis Cordoba said. Researchers also believe there may be more such traps in the area. But during preparatory excavations, workers at the site found themselves digging up woolly mammoth bones-hundreds of them.