椰子蟹爬树猎杀海鸟:将翅膀夹断再分食
文章来源: 腾讯科技 于
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在印度洋中部的查戈斯群岛,研究者拍摄到了这一令人震惊的一幕。一只体型巨大的椰子蟹向一只海鸟发起攻击,生生将其翅膀夹断,无法动弹。
接下来,椰子蟹开始慢慢吞食这只受伤的海鸟。在此之前,科学家还从未记录过这样的行为,或许这将是新的研究领域。
研究者发现,椰子蟹会有条不紊地跟踪、杀死并取食海鸟,这是一场有预谋的捕猎。这只椰子蟹爬到树上,悄悄靠近在巢中沉睡的海鸟,然后用强有力的螯肢夹断海鸟的翅膀,并将其摔到树下的沙地上。
接着椰子蟹也爬到树下,将海鸟另一只翅膀夹断,使其只能苟延残喘,动弹不得。随后,又有5只椰子蟹爬了过来,开始将海鸟分而食之。
美国达特茅斯学院的研究者马克莱德雷拍摄了这段影像,揭示了椰子蟹行为的另一面。莱德雷计划在后续研究中确定这种新的捕猎方式在岛上是否普遍存在。他计划在椰子蟹的洞穴附近放置摄像机,拍摄它们的捕猎行为。
椰子蟹是最大的陆生无脊椎动物,重量可达4千克,伸展开来能有1米宽。莱德雷的发现第一次揭示出,这种体型巨大的甲壳动物能主动猎食较大的脊椎动物,它们很可能是岛上生态系统的统治者。
日本研究者在2016年发现,椰子蟹的螯肢夹起来的力量能达到3300牛顿,比任何甲壳动物的都要强,可以和狮子等大型掠食者的咬力相媲美。经过测算,椰子蟹的螯肢能产生相当于自身体重80到100倍的力量。视频中这只椰子蟹大约有2千克重,能轻而易举地夹断海鸟的骨头
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