You're moving the goalposts in the usual Creationist manner. You asked for a transitional form. I gave you one. I stated it has characteristics of both reptiles and birds, and therefore is a reasonable example of a transitional form between them. Now you're demanding that I show something else.
Sorry, I've been doing this too long to buy into your bait and switch. You said there were no transitional forms. You either retract that statement, or explain why, given that it has reptilian as well as avian characteristics, Archeopteryx is not what one would expect of a form transitional between reptiles and birds. Let's deal with this before we address the platypus.
No, I think it's clear in the discussion what has been talked about. Quite clear in fact. You ignore the discussion and try to make this some other discussion you've had. Sorry you can't fit the world into a box. I think I've been rather clear as to what we're looking for here. For you to show systems growing into a species creating a change. That is a transition - not a fully developed species seperate to itself. A transition between species. Show the fish growing legs, arms and lungs, etc. You can't. But that is a transition. We're all aware of the dodges built into your arguments - they're there for a reason - so you think you can't be put on the spot.