[Tribune7]

One prediction of evolution: Birds will never be born with mammary glands or three earbones, or differentiated dentition. Another prediction of evolution: Frogs will never develop feathers.

Those aren't predictions. Those are observations. Birds don't have mammaries. Frogs don't have feathers.

[Junior]

They are predictions: Birds will never be born with mammaries and frogs will never have feathers. An observation would say, as you pointed out, that birds do not have mammaries and frogs do not have feathers, which is why I specifically phrased the predictions in the way I did.