And unrelated birds that had been reared together for a short time scorned their broodmates and preferred to lek near relatives who were perfect strangers instead.

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Whether it is a pedigreed oil painting of the family (in the best of cases, a Sargent) or a plucky image of oneself (perhaps a Warhol, but probably not a Freud), people love to keep representations of their relatives near at hand.

WSJ: Family Photos: Hide or Show?

Staying near children, other relatives and old friends easily might outweigh everything else.

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Donna Wright, from Spennymoor, County Durham, admitted harassing relatives of Katrice Lee, who went missing from a shop near an army base in Germany in 1981.

BBC: Donna Wright sentenced for claiming to be Katrice Lee

Concerned relatives have joined the search for some 30 fishermen from the Bashkhali area - near Chittagong and some 300km (190 miles) south-east of the capital Dhaka - who set sail last week.

BBC: Pirates 'kill fishermen' off Bangladesh