"We discovered, to my great surprise and joy, that hedgehogs can hear up to 85kHz" Rasmussen said.
Hole soil analysis also found ancient pollens of maize – a key staple in the Andes – and reeds traditionally used for basket-making. In addition to this, there were traces of squash, amaranth, cotton, chili peppers and other crops that haven't been farmed on the arid land where Monte Sierpe sits. Because many of these plants produce little airborne pollen, it's unlikely they settled in the holes naturally. Instead, the researchers believe, people carried goods to the site and deposited them in the holes, likely using baskets or bundled plant fibers that were periodically replaced.
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