Last year, a test of cephalopod smarts reinforced how important it is for us humans to not underestimate animal intelligence.
) can refrain from eating a meal of crab meat in the morning once they have learnt dinner will be something they like much better - shrimp.
The doors also had symbols on them that the cuttlefish had been trained to recognise. A circle meant the door would open straight away. A triangle meant the door would open after a time interval between 10 and 130 seconds. And a square, used only in the control condition, meant the door stayed closed indefinitely.
The researchers found that all of the cuttlefish in the test condition decided to wait for their preferred food , but didn't bother to do so in the control group, where they couldn't access it.
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