So how do colourful coastal cephalopods (cuttlefish, squid and octopus) do it, or know to do it?
Change their skin colour, that is, to match their environment as an effective camouflage - because scientists from the Queensland Brain Institute have now found out that they are pretty much colour-blind, in spite of their quick-change tricks.
It doesn't sound like an intuitive jump, but Professor Justin Marshall and Dr Wensung Chung that these "remarkably intelligent" animals (pictured below) can however adjust their visual focus, from green in coastal waters, to blue to match deep sea conditions when necessary.
The study was published in Proceedings B, was funded by the Australian Research Council.
CLICK HERE for the abstract.
"Moobs" (enlarged breasts on a man), "gender-fluid" (one who doesn't identify with a single fixed gender), YOLO (acronym for "you only live once") and FOMO ("fear of missing out") are among 1,200 new entries listed in the latest edition of the iconic Oxford English Dictionary.
Other obscure entries include Chefdom (the business of becoming a chef), fuhgeddaboudit (an Eastern US colloquialism meaning "forget about it"), Yogalates (when Pilates exercises are combined with the postures and breathing techniques of yoga) and spanakopita (a Greek spinach and cheese stuffed filo pastry pie).
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