ナショナルジオグラフィックのインスタグラム(natgeo) - 10月22日 00時01分

Video by @BertieGregory. An octopus on the hunt at night in the northern Red Sea, Egypt. Here the octopus is net feeding where it spooks fish into little caves before ballooning with its 8 tentacles blocking all exits. Predators like this octopus are crucial to the functionality of coral reefs as they keep the number of grazing animals in check. If octopus are overfished and removed the reef, the number of grazers increases and the reef as a whole suffers. Long story short, ecosystems need predators. When you look after the predators, you look after everything underneath. Follow @BertieGregory for more wildlife adventures!

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• BertieGregory