An animated evolution of life? Fantastic; should have Doctor Jacob Bronowski boogying in his grave. But then they go and spoil it all by missing out what is basically a huge chunk of time - how does the crocodile thing suddenly change into an ape? Isn’t it also a bit convenient that this happens when it’s behind a tree? Then they add insult to injury by making the ape waste loads of time thrashing about at the top of a cliff doing absolutely nothing to advance the story.
Also the dinosaur silhouette visible on the horizon when the fish is evolving legs annoys me too. If there are dinosaurs already then what’s the fish doing coming out of the water then? Plus the silhouette remains visible for far too long.
In my humble opinion the only thing that saves it is the self satisfied grin and shrug that the human gives just after he has turned into The Fat Boy.