A new study has found that cuttlefish may communicate with each other by waving.
The marine animal is already known to change colour on demand, clone themselves and even turn invisible.
But when their pal comes along, it appears they use one of their ten limbs to say hello.
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The researchers behind the discovery are Sophie Cohen-Bodénès and Peter Neri.
In a bid to cement their findings, they recorded two types of cuttlefish – sepia officinalis and sepia bandensis – signing and played this back to individuals.
The result? The animals waved back, reports Need To Know.
In a clip, a cuttlefish can be seen vibrating, before using one of its tentacles in a waving motion.
Another video shows it using all of its tentacles to push up against the water, creating a ripple effect.
When multiple are placed in a tank together, they appear to move a few of their limbs at once in the direction of another – indicating a different type of wave.
The scientists, who are part of École Normale Supérieure in France, found four waving patterns that were consistent; up, side, roll and crown.
Sophie and Peter also discovered that they were more likely to respond if the clip was played upright, as opposed to upside down.
As the waves cause movement in the water, this could explain how it’s used as a form of communication.
While more research is needed to absolutely prove that cuttlefish talk by waving at each other, it’s opened up discussions surrounding this in the likes of octopus and squid as well.
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