Techno2000:
I would believe if I could actually see something transitioning right now, in real life, like a new fin or a new feather growing out of a animal we have today.
I doubt it, you’ll just reject it. First of all you’d need to know what a given feature will be a long time from now. A flipper could be a wing 100 million years down the road but today it’d be a flipper.
Mudskippers are a good modern animal that appears to be going through a water to land transition. That may not be where they ultimately end up, without the ability to predict the future we have no idea. The environment may reward changes that allow them to spend more time on the land, or it may not.