Evolving New Information

You might lose that one --- platypods have lost most of their teeth (some people will tell you that they're completely edentate, but as far as I can make out they're wrong). You're right. This is in fact a classic example of superficial convergent evolution. If you look at the tail of the beaver, it has a standard set of spindly caudal vertebrae and the oar shape is provided by flesh. But if you look at the tail of the platypus, the oar shape is actually skeletal. (LucyTheApe might like to notice the vast morphological difference between the "bill" of a DBP and the beak of a bird.)See here for more information.Now, back to the topic ...Edited by Dr Adequate, : No reason given.