沙鲨(Psammonarus Spp.),香肠般的身体顶著一颗钝形、强壮的头部,以及强而有力、铁锹般的脚.它在沙中游泳,而非挖洞,利用鼻子尖端感应的纹孔嗅出方位,直捣齧齿动物的巢穴.沙鲨全身几乎无毛,大部分的时间都是埋在沙中避免体温剧烈改变.休息的时候只有眼睛和鼻孔尖端露出地表.
他们对诸如沙鲨等小一点的鲨鱼所咬食的伤口进行了测量，或把大鲨鱼击昏，用电击刺激其颌部肌肉，以测量其咬劲。
They also measured the bites of small sharks such as sand sharks, and tested larger sharks by knocking them out and using electricity to stimulate the jaw muscles.
不过，科学家们认为，尽管沙锥齿鲨锋牙利齿的外表很吓人，但它们实际上是性情温和的动物，只有被激怒时才会咬人。
Biologists from Macquarie University in Sydney insist that grey nurse sharks, while terrifyingly toothy in appearance, are mild creatures which will bite humans only if provoked.
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