Pair bonding removes the competitive conditions that drive weapon evolution.

Evidence

Similarly, males in three additional stag beetle species started forming stable, long-term pair bonds with single females and helping them raise their young—causing two of the three arms race ingredients to disappear. Now, not only were males not battling over localized sap sites, they weren’t even battling at all. The reproductive turnaround times of males were so similar to those of females that there was almost no competition. Today, their mandibles are tiny. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 439

Categorization

• XREF: Directly parallels the thesis of the book’s animal-human warfare analogy: when competition for monopolizable resources disappears, arms races collapse. — connects to: One-on-one duels favor weapon evolution while chaotic scrambles do not. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 245; Losing the ecological context of competition can make extreme weapons vanish. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 438; Weapon evolution needs both competition and economically defensible resources — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 191 (+1 more)
• DEFINE: Illustrates the ‘three ingredients of arms races’ framework by showing what happens when they are removed.

Related

• Losing the ecological context of competition can make extreme weapons vanish. (similarity 0.89)
• Weapon evolution needs both competition and economically defensible resources (similarity 0.86)
• Specific conditions are required before weapons escalate into an arms race (similarity 0.85)
• Specific ecological circumstances must align before weapon arms races begin (similarity 0.85)
• Three conditions must align to trigger an animal weapons arms race. (similarity 0.84)
• Weapons disappear when fights stop being duels over defensible resources (similarity 0.84)
• Intense competition without duel structure does not drive weapon evolution. (similarity 0.83)
• Competition for reproduction drives evolution of nature’s biggest weapons (similarity 0.83)
• One-on-one duels favor weapon evolution while chaotic scrambles do not. (similarity 0.82)
• Dueling plus competition and defensibility is the general rule for extreme weapons (similarity 0.82)
• Arms races inevitably stall as weapon costs neutralize reproductive benefits (similarity 0.81)
• Extreme skew in mating success drives arms-race escalation in weaponry (similarity 0.81)
• Weapons evolve only when reproductive benefits exceed costs (similarity 0.81)
• State arms races mirror single male-male animal contests, not evolutionary turnover (similarity 0.81)
• Social competition environments evolve in tandem with weapons, unlike fluctuating physical environments (similarity 0.80)

Broader Connections

• Weapons disappear when fights stop being duels over defensible resources #corroborates (0.75)
• Weapon evolution needs both competition and economically defensible resources #contradicts (0.70) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 191