Small but feisty: the clever cuttlefish that changes colour to bedazzle predators

If you love a feisty rebel, look no further than the flamboyant cuttlefish, on the 10-strong shortlist for the Guardian’s invertebrate of the year 2025. It is small, smart, capable of spectacular displays and has fought against the odds to become the deadliest of its kind. This creative creature is small for its class of cephalopods, which includes octopus, squid and nautilus, at just 6-8cm. Due to the relatively reduced size of its air-filled cuttlebone, a unique internal shell used for buoyancy that lends these molluscs their unique, rather alien-spaceship way of swimming, it cannot float or hover as well

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