“Platypus babies cut their way out of the egg using a sharp ‘egg tooth’ ― a horny spike on the nose that is made of keratin, the same material as fingernails, that later falls off ...

The Riversleigh Platypus also had large teeth, whereas today the Platypus has no teeth at all. (Baby Platypus have teeth, but they lose them while they are still very young. The adult Platypus ...