think about how Someonewhocares is insisting that the platypus be accepted as an example of what evolution says represents a transitional.
While no modern organism is transitional with any other modern organism in any meaningful way, monotremes have retained a lot of features that 'bridge the gap' between early synapsids and modern mammals. Features such as egg laying, excreting and reproducing through the same orifice, internal testes, some skeletal features (epipubic bone for example), sperm characteristics that are both reptillian in appearance and mammalian etc etc
They do highlight the kind of thing we are looking for in a transitional form purely because they have retained ancient features that placental mammals have not.
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