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Fish appear to be individuals with complex personalities according to new research.
Researchers tested the idea that Trinidadian guppies all had a fairly standard response to potential dangers.
The theory went that they had a ‘simple spectrum’ of reactions to danger – some things were more frightening than others but the fish basically all responded in the same way.
However when confronted by a new situation or a potential predator – such as a model of a heron in laboratory tests – the guppies proved they were all individuals.
Some were essentially braver than others.