MEXICO CITY — Archaeologists have found the bones of about 60 mammoths at an airport under construction just north of Mexico City, near human-built ’traps’ where more than a dozen mammoths were found last year.

Both discoveries reveal how appealing the area — once a shallow lake — was for the mammoths, and how erroneous was the classic vision of groups of fur-clad hunters with spears chasing mammoths across a plain. Humans may have been smarter — and mammoths clumsier — than people had previously thought.

For the moment, however, Mexican archaeologists are facing a surfeit of mammoths, almost too many to ever excavate.


“There are too many, there are hundreds,” said archaeologist Pedro Sánchez Nava, of the National Institute of Anthropology and History.

The excavations were conducted on the shores of an ancient lake, once known as Xaltocan and now disappeared. The shallow lake apparently produced generous quantities of grasses and reeds, which attracted mammoths who often ate 330 pounds of the stuff every day. “It was like paradise for them,” Sánchez Nava said.

The excavations are about 6 miles away from the mammoth pits found last year in the hamlet of San Antonio Xahuento. There, two human-built pits were dug about 15,000 years ago to trap mammoths, which apparently couldn’t clamber out of the 6-foot deep traps.

The institute said hunters may have chased mammoths into the traps. Remains of two other species that disappeared in the Americas — a horse and a camel — were also found in the sediments, at layers corresponding to 15,000 to 20,000 years ago.

The huge number of mammoths being discovered may also change scientists’ views of how frequently mammoth turned up on the dinner menu of our ancestors.

“They used to think it was very chance, sporadic,” Sánchez Nava said. “In fact, it may have been part of their daily diet.”

Mammoth bones have always been so numerous in the area that the Aztecs, who ruled the Mexico Valley between 1325 and 1521, recorded having found the enormous bones; Sánchez Nava said the Aztecs interpreted them as proof of legends that giants had once populated the valley.

Sánchez Nava said the large numbers of remains will allow scientists to research how mammoths fed and whether they were already suffering genetic inbreeding or decline, which could have contributed — along with human hunting — to their extinction on the mainland about 10,000 years ago.

Sánchez Nava said nothing had been found that would require halting work on the airport project, in which the old military base is being converted into a civilian terminal.

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