Under what condition does a yellow sac spider typically deliver a bite?
Answer
When it feels directly threatened, often when trapped against the skin.
The biting behavior of the yellow sac spider is almost universally described as defensive, not aggressive or predatory toward humans. Bites most frequently occur when the spider is unexpectedly pressed against human skin, such as when a person rolls onto one while sleeping in bed or puts on clothing that has remained undisturbed for a period, thereby trapping the spider against the body. This physical constraint triggers the defensive reaction that results in a bite, emphasizing that direct threat is the primary catalyst.
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