NoNukes writes:
Not a subject that I have ever cared about, but what is your point?
I'm seeing contradictory evidence too.
My preconception is that ostriches evolved from flighted birds so I'd expect them to have the same urinary structures. The development of a bladder and all the mechanisms that go with it is non-trivial - so if true, it's rather amazing.
However, birds descended from reptiles and apparently some reptiles do have bladders so maybe the answer is parallel development.
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