Are humans the only species to keep other species as pets?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

Are humans the only species to keep other species as pets, purely for the owner’s pleasure, rather than out of any necessity?

Clare Dunkley, Finchley, London

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Source: theguardian
Are humans the only species to keep other species as pets?