What causes those conical divots in the soft, dry soil beneath large conifers in the mountains and at the bases of cliffs on the Colorado Plateau? They presented a mystery when I first noticed them, for it was evident that something must be both constructing and maintaining them. Otherwise, breezes and gusts would soon fill them with sand, dust and forest litter. Yet they seem to be empty and unattended.

Jeff Mitton/ Natural Selections

Jeff Mitton. Natural Selections

Antlion larvae are the…

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