Box jellyfish seem to have eyes that peer constantly upwards, allowing them to navigate by detecting features on land. Anders Garm at the University of Copenhagen and his colleagues made video recordings of the box jellyfish Tripedalia cystophora (pictured), which has a total of 24 eyes, made up of four types. The team found that four of these -the 'upper lens' eyes - always point straight upwards, regardless of the animals' orientation.
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