Whilst using the gift of gab dentures, Sabrina says that the Duck billed Platypus is the only mammal that lays eggs. This is not true, along with the Duck billed Platypus, there are 4 species of Echidna which also lay eggs. Collectively these animals are known as Monotremes. They are also the only Mammals which are venomous.
The magical dentures which give Sabrina the gift of the gab, which is simply the ability to find talking easy, somehow also give her knowledge on any subject, including giving her the ability to speak another language.