 After this, Minty and Melanie often swap places — with almost nobody suspecting the truth of the situation.Although the two girls seem to be identical in many ways, there are significant differences between the two.For instance, Melanie is good at sport – but Minty is not; Melanie can sing – but Minty can't; Minty can dance – but Melanie can't; Minty is studious – but Melanie is not; Minty knows about wildlife – but Melanie does not (Melanie thinks that whales are fish).