Look for a second line at the front of the skull -- the coronal suture – which fully fuses by age 40. Study the teeth. If they're ... better-suited to carrying a baby. For a quick identification ...

(Baby Platypus have teeth, but they lose them while they are still very young. The adult Platypus breaks up ... Fossils: The skull of the Riversleigh Platypus is one of the most perfect fossils ...