雙髻鮫的頭,為什麼形狀這麼特別?
研究顯示,這種頭型使雙髻鮫擁有360度全方位的視野,
雙髻鮫靠左右搖擺動來看到正前方,判斷獵物與它們之間的
雙髻鮫奇特的頭形給牠帶來更多好處。牠們只要稍稍扭動腦
Widely set eyes give hammerhead sharks exceptional binocular vision
The hammerhead shark’s head is one of the strangest in the animal world. The flattened hammer, known as a ‘cephalofoil’, looks plain bizarre on the face of an otherwise streamlined fish, and its purpose is still the subject of debate. Is it an organic metal detector that allows the shark to sweep large swathes of ocean floor with its electricity-detecting ability? Is it a spoiler that provides the shark with extra lift as it swims? All of these hypotheses might be true, but Michelle McComb from Florida Atlantic University has confirmed at least one other -the hammer gives the shark excellent binocular vision. The T-shaped hammerhead configuration also allows the sharks to see 360 degrees, with respectable stereo rear view.
原文下載Download the full research paper here:
McComb, D. M., Tricas, T. C. and Kajiura, S. M. (2009). Enhanced visual fields in hammerhead sharks. J. Exp. Biol. 212, 4010-4018.
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