巨蜥非常聰明,一些物種甚至可以數數。[6]在聖地牙哥動物園,一項研究將不同數目的蝸牛餵給非洲巨蜥,發現牠們可以數數到六。[6][7]尼羅河巨蜥是會合作覓食:一隻巨蜥會引開母鱷魚離開巢穴,其他的則進入吃鱷魚蛋。[6]作為餌誘的巨蜥之後會回來一同吃蛋。[6][7]在華盛頓史密森尼國家動物園(Smithsonian National Zoological Park)的科莫多龍可以辨認出動物園管理員,且似乎也有不同的性格。[7]
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