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跳蛛科（學名 Salticidae），係蜘蛛目嘅一科。
因為佢捉獵物嘅方式好似老虎咁，所以又叫做蠅虎。跳蛛視力非常好，鍾意蹦蹦跳跳。走近獵物個陣，先逐步行近，然後喺最近嘅位置蹼去獵物度。喺天花板上倒立行個陣重可以跳起捕食。因為喺樹度等高處跳會跌落嚟，所以預備跳個陣會先貼上一條絲，就好似爬山嘅人用岩釘同繩防止跌落嚟咁樣。
跳蛛嘅頭胸部比起其他科較方形（圖一）。頭胸部上嗰八隻眼，其中兩隻平常比其他嘅大（圖二）。
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