Expelling indigestible objectives through the cloaca is an important cleansing behaviour for several species of higher vertebrates. Although intestinal eversions are short in duration and rarely observed in free-ranging predators such as sharks, exposed intestines are vulnerable to attacks by smaller predators exploiting ejected digested material. Here we describe the first published record of an intestinal eversion in an oceanic whitetip shark (Carcharhinus longimanus) followed by chase and bite attempts by rainbow runners (Elagatis bipinnulata) in the northern Red Sea, Egypt. This observation provides additional evidence that intestinal eversion occurs in free-ranging sharks and can last for an extended time (> 2 min), likely increasing the potential for attacks by smaller predators.

中文翻译：

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中上层鲨鱼的肠外翻引发了大型卡兰科鱼类的追逐和咬伤尝试

通过泄殖腔排出难以消化的物体是几种高等脊椎动物的重要清洁行为。尽管肠道外翻持续时间很短，并且在鲨鱼等自由放养的捕食者中很少观察到，但暴露的肠道很容易受到利用排出的消化物质的较小捕食者的攻击。在这里，我们描述了在埃及红海北部的大洋白鳍鲨 (Carcharhinus longimanus) 肠道外翻的首次公开记录，随后是彩虹鲨 (Elagatis bipinnulata) 的追逐和咬伤尝试。这一观察结果提供了额外的证据，表明自由放养的鲨鱼会发生肠道外翻，并且可以持续很长时间（> 2 分钟），这可能会增加小型捕食者攻击的可能性。