This species preys on ground and rock squirrels, which by six weeks of age develop a natural resistance to withstand a full envenomation, suggests research at the University of California, Davis.

 
  • 北太平洋響尾蛇可捕食地面和巖石間的松鼠,不過(guò)這種松鼠在六周大時(shí),就可自然發(fā)育出抗毒機制。
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