This fish builds crop circles.

Male pufferfish spend 7–9 days sculpting a roughly 2-meter-wide circular nest to attract a mate. They carve radial valleys with their fins and body, which funnel fine sand toward the center; in a half-scale flow test, the current there was 24.2% slower. Females visited during the final stage and spawned in the center, but the exact nest feature driving their choice is still unknown. 1

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