Lol if you want some kind of major documented change where a species of animal became 100% unrecognizable from what it once was you're not gonna get that. We've been actively looking at and observing evolution for about 160 years. That's less than .000001% of the time the dinosaurs were walking around on earth. And even less of a percentage of the total time life has been evolving on earth. Adaptation to the environment is natural selection. Which is evolution. But if you want to say evolution isn't evolution, and set your own standard for what it is I can't help you.