This just in from the Grand Academy of Lagado, administering electric shocks to crayfish can make them 'fear' the prospect of future electric shocks.

An experiment showed that the humble freshwater crayfish can be induced into a state of deep anxiety - one that can only be alleviated by the same type of tranquilisers used to treat humans.

The invertebrates, somewhat understandably, became nervous and flicked their tails as an escape response as a result of being subjected to the shocks.

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