What is the main defense mechanism noted that A. gracilipes lacks compared to Solenopsis invicta?
Answer
Stinging defense
The text explicitly contrasts the defensive tactics of the yellow crazy ant with those of the Red Imported Fire Ant (*Solenopsis invicta*). While *Solenopsis invicta* is known for its distinctive stinging defense mechanism, *A. gracilipes* relies instead on sheer population numbers and unique chemical defenses (though they can bite) rather than a specialized sting for defense.
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