The braini­est crit­ter in the sea

They may look weird, but don’t let ap­pear­ances fool you. These colour-blind crit­ters are some of the bright­est an­i­mals in the briny blue

World of Animals - - All About Cuttlefish -

With the largest brain-to-body ra­tio in in­ver­te­brates, cut­tles are able to in­ter­pret com­plex sig­nals thanks to their many amaz­ing senses, pro­vid­ing these fas­ci­nat­ing crea­tures with ad­vanced de­ci­sion-mak­ing abil­i­ties.

Tests have shown that cut­tle­fish may possess an episodic-like mem­ory. In the same way that we can dis­cern our mem­o­ries in terms of what, when and where, cut­tle­fish have proved that they’re able to do this with their food, re­turn­ing to ar­eas where food was plen­ti­ful and avoid­ing ar­eas where hunt­ing was poor.

In var­i­ous other tests, cut­tle­fish have also shown an aware­ness of num­bers. For ex­am­ple, ju­ve­nile cut­tle­fish are able to tell the dif­fer­ence be­tween higher and lower num­bers of prey some­thing that tod­dlers aren’t able to do. These one-month-old cut­tle­fish were even able to dis­cern be­tween (and make hunt­ing de­ci­sions based upon) num­bers of larger ver­sus smaller prey and also live ver­sus dead food.

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